Kai Mügge is one of the few actively working physical mediums in the German-speaking world. Since the early 2000s he has led the Felix Experimental Group (FEG) in Hanau – a stable home circle in which the same phenomena occur that have been described in mediumship research since the late 19th century: raps, materialisations, ectoplasm, apports, direct voice, light phenomena. Unlike most mediums working today he does not operate in mental contact with the spirit world, but in a tradition linked to names such as Daniel Dunglas Home, Eusapia Palladino, Florence Cook and Rudi Schneider – a tradition that, after 1906, largely disappeared from academic view and which we have reconstructed in detail in our 1906 pattern series.
What is physical mediumship?
With mental mediums (such as Pascal Voggenhuber, Kim-Anne Jannes, Gordon Smith or Mavis Pittilla) communication with the spirit world takes place within the medium's consciousness: images, words, feelings, intuitive impressions. The sitters hear the messages retold by the medium.
In physical mediumship something else is added. Phenomena are reported – and, under the classical conditions of a séance, observed – which take place in the room and are in principle perceivable simultaneously by everyone present: clearly audible raps on walls and tables, the floating or moving of objects, the sudden appearance of objects ("apports"), floating lights, hand- or face-like formations emerging from a soft, whitish-looking substance (historically known as "ectoplasm" or "teleplasm"), and voices that do not come from the medium's mouth but from the room itself ("direct voice"). That such phenomena have been observed is well documented in the historical literature – for example in the Paris sittings of the Curies with Eusapia Palladino in 1905/1906, in William Crookes's investigations, or in Charles Richet's metapsychical studies. What such phenomena are, and how they come about, has been the open question of the past 150 years.
Kai Mügge and the Felix Experimental Group
Kai Mügge comes from Hanau in Hesse and came to his mediumship in early adulthood, after first engaging with the history of physical phenomena out of personal and literary interest. In the early 2000s he founded the Felix Experimental Group – a closed home circle in the classical mould: fixed sitters, regular meetings, agreed conditions, sessions in red light or complete darkness, clear protocol. His sister Julia has long been part of the group's core; the FEG deliberately operates as a group, not as a solo stage.
The FEG's sessions follow a choreography that is historically recognisable: opening with prayer and song (the sitters' energy has played a role since the beginnings of mediumship research), trance of the medium, the appearance of a guiding personality from the spirit world – in the FEG's case a voice that identifies itself as "Professor" – and then the various phenomena. Over the years the FEG has received international sitters, has held workshops and seminars in Germany, Switzerland, Italy, the United Kingdom, the United States and Australia, and has documented some of the phenomena on infrared video.
What is reported in a sitting
In the FEG's session reports, and in the reports of observers who have attended over the years, recurring phenomena appear:
- Raps and mechanical effects: clear knocks at different points in the room, sometimes in answer to questions.
- Light phenomena: small, freely floating luminous points, so-called "spirit lights", moving through the room.
- Ectoplasm / teleplasm: emergence of a soft, whitish-appearing substance from the medium's mouth, nose or chest, from which hand- or face-like forms occasionally take shape.
- Apports: the sudden appearance of small objects – stones, jewellery, gemstones, fragments of plants, sometimes old coins.
- Direct voice: voices that do not come from the medium's mouth but from the room itself, often from the height of an indicated voice trumpet.
- Materialised hands and faces: short-lived structures that present themselves to the sitters as touchable or photographically documentable.
The FEG works here in a line that goes back to the séance practice of the late 19th and early 20th centuries. Under present-day conditions, however, it has aids at its disposal that were not openly available to its predecessors: infrared and night-vision cameras, highly sensitive microphones, controlled sitter composition. These aids are used in some sessions and deliberately not in others – with the rationale the FEG takes over from the historical research: certain phenomena measurably occur less frequently under full control, an effect already discussed extensively by Charles Richet with Palladino and by William Crookes with Florence Cook.
The fraud allegations – what can be reconstructed (and what cannot)
An honest portrait has to name the phase in which the FEG came under the greatest pressure – and it has to tell it precisely, because it is usually reduced to a single clause ("Mügge was exposed as a fraud") that simply is not accurate. Even the origin of the allegations is notable: they came not from sceptics outside the field, but from two of its most prominent figures – the biologist and parapsychologist Michael Nahm (IGPP Freiburg) and the philosopher Stephen Braude, then president of the Parapsychological Association and editor of the Journal of Scientific Exploration.
The strand involving the lights. In 2011 a former core member left the circle and accused Mügge of faking phenomena – at first without evidence. It became more concrete when the FEG's then circle leader reportedly found a small light device (similar to the magician's prop "D'Lite") in Mügge's travel bag after a sitting in Koblenz; in 2014 Nahm added a photographic analysis of some public sittings. Confronted with both, Mügge is said to have privately admitted to the device – according to the investigators' account. Mügge has denied exactly this: the conversation never took place, he says, and he accused Nahm of spreading untruths. What remains is this: no one observed Mügge using such a device in a controlled sitting – what was found, on one participant's testimony, was an object in a bag.
The strand involving the ectoplasm. At a sitting in Austria in May 2013 – this time with Braude in the room – Mügge displayed glowing green "ectoplasm". Crucial for the assessment: this material was never examined in a laboratory. Braude's conclusion rests on a visual comparison – to him it looked like phosphorescent Halloween spider web – and Nahm stated that he had seen an invoice for more than a kilogram of such material bearing Mügge's name. There was no chemical or physical analysis of the substance shown. Notably, the same Braude expressly described other phenomena of Mügge's – object movements and table levitations under four-limb control – as his most convincing and unexplained.
What this proves – and what it does not. In none of the documented controlled séances was Mügge observed manipulating anything live. What exists is purely circumstantial: an object found in a bag, an invoice for material, a photographic interpretation, and a disputed private admission that Mügge calls a lie. An invoice proves possession – not that the material was ever used even once, far less that every phenomenon reported over years was produced this way, and certainly not that there were never any genuine phenomena. Even Braude's own argument was conditional: if manipulation had occurred at one point, that would not explain the totality of the very differently structured phenomena.
How it continued. The collaboration ended in conflict; Braude thought it unlikely that Mügge would submit to further strict controls, and called the significance of the case "indeterminate". Mügge has continued his work and, from 2021, set it on a new footing with Prof. Eckhard Kruse, who documents the phenomena with sensors (movement, temperature, pressure and more) and – unlike the earlier investigators – assesses them positively; anyone who wishes can listen to his conclusions in his interviews and videos for themselves.
See for yourself. Kruse documents the sittings today with means that simply were not available to the early investigators – including infrared footage in which the formation of the ectoplasm becomes visible. The researchers of that era could not capture anything at this level of precision; the measuring and recording technology, and the technical know-how it requires, were beyond them. So anyone who wishes to follow the criticism of the old investigators should first take the time to look at Kruse's recordings and his assessment and form their own picture – the ongoing documentation lies open on Kruse's research page (also linked on our knowledge page).
How an accusation sticks. The case is, incidentally, a fine example of how a criticism once raised – here the charge of fraud – takes on a life of its own and is passed along everywhere, without anyone taking the trouble to check it again for themselves or even to hear the other side. The label stays stuck; the evidence behind it is hardly ever re-examined. Anyone – a TikToker or YouTuber, say – who genuinely wants to know more would have to attend a sitting themselves, rather than merely passing the accusation along.
Context within the tradition
Physical mediumship is the historically oldest and academically most contested form of mediumship research. It was the concrete occasion for the founding of the Society for Psychical Research in London in 1882 (with J. J. Thomson, Lord Rayleigh, Oliver Lodge and William James as later presidents) and the main empirical source of the Curie–Palladino file, which opened the 1906 pattern. After 1906 it almost entirely disappeared from the academic standard picture – not because the phenomena ceased or had been fully explained, but because the institutional climate of academic psychology and physics shifted into a purely materialist narrowing.
That Kai Mügge still works in this line today is a rarity. In the German-speaking world there are only a handful of active physical home circles; internationally the number is also limited. The FEG is therefore one of the few living points of comparison with the historical session protocols.
Why Kai Mügge matters
- A living benchmark: the FEG makes it possible to observe classical séance phenomena under contemporary conditions – rather than only talking about historical texts.
- Honest dealing with criticism: the fraud allegations of 2013–2015 are part of the documented history, not hidden – and have been discussed controversially inside and outside the FEG.
- Current research against the grain: the ongoing investigation is led by Prof. Eckhard Kruse with open sensor documentation; he reports, however, that such findings are barely publishable in today's academic system – what decides is "what may and may not be published", not the finding itself (more in the portrait of Eckhard Kruse).
- Keeping the tradition visible: by continuing the séance practice, the FEG keeps open a line that was institutionally shut down after 1906 and remains relevant for today's consciousness debate.
Kai Mügge's work is not the most comfortable material for a modern audience. It demands two things at once: the readiness to admit unusual phenomena as data points in the first place, and the readiness not to lose sight of the methodological strictness that, since Crookes and Richet, has been part of any serious investigation in this field. Precisely in this double stance – not in blanket assent and not in blanket rejection – lies the actual value that a contemporary physical medium has for research.
Sources: Kai Mügge's own website (kaimuegge.de) and FEG documentation. Stephen E. Braude, several papers on the Felix Experimental Group in the Journal of Scientific Exploration, Society for Scientific Exploration (available in the JSE online archive). Historical comparative literature: Charles Richet, Traité de Métapsychique, Félix Alcan, Paris 1922; William Crookes, Researches in the Phenomena of Spiritualism, London 1874; and the session protocols of the Society for Psychical Research on Eusapia Palladino, Daniel Dunglas Home and Florence Cook.