I had a lecturer who had seen IBM experiment using projections onto manikins placed around a board table shared with 'real' humans, and a mirrored arrangement o

I had a lecturer who had seen IBM experiment using projections onto manikins placed around a board table shared with 'real' humans, and a mirrored arrangement on the other side of the 'electric' connection, old enough to be an entirely analogue affair, if anyone has an idea what he might have been referring to I would love to know!