Starlab are a US company who started out by making a combination of air filled projection domes (no underside to them - they sit on the floor) paired with light projectors which project star fields inside the domes using a light source and cylinders with holes and patterns cut-out. These were used in education. Starlab in the uk is now no longer around but the product is still in use and sold elsewhere. Starlab have gone on to develop larger domes and digital projection displays via a standard projector pointing up and fitted with an extreme fisheye lense to project in the round. I have a friend who is in contact with the uk company as was and may be able to find a dome, I am following up on this..
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