The curious case of a column in the middle of a Martian Diorama in the Powerhouse Museum, a science museum in Sydney.
The eyelids on the star projectors on the spheres at either end of the Zeiss Mk. IV Planetarium Projector occlude the projections that would otherwise land on the audience (and the hemispherical view that would be obscured by the earth, given the position of the projection).These ingenious devices work simply through gravity.
This is the same projector (from the Griffith Observatory) of which I posted some pictures a couple of weeks or so ago.
I am back working on the paradoxical shadows. Instrument Six (below) proved that I could make a floating shadow (hovering in mid air and detached from the surface that it should by rights land upon), both photographically and as a direct experience. For the latter, the candles worked very beautifully but require a very dark space to work in and have practical limitations, so I am making new instruments with electric light bulbs instead. The new instruments will test a host of possibilities raised by Instrument Six.