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The red ring has lasers that make a plane of light. The lasers are eye-safe, but nevertheless people should not stare directly at them. Kids may find it neat to put their hands in the ring, and that is just fine.
Participants can pick up any one of several objects and hold them in the laser ring to see their cross-sections. Rotating the object and moving it in and out can give different shaped cross-sections. Here are some challenges you can give the participants:
There is also a plastic model of a human. Let the visitors find different cross-sections as they move the figure through the laser plane.
The lasers can become misaligned if banged. Feel free to adjust them -- simply aim each laser at the lasers on the opposite side of the ring.
The objects are made of polycarbonate and are weakest at the joints. They can break if dropped. Please make sure that participants use the objects only within the laser ring -- the objects should not be tossed around or removed from the area.