Whirling Watcher
The visitor looks through slots radiating from the center of a spinning disk. This provides the visitor with a simple stroboscope with which a variety of objects may be viewed. On the back of the disk is a cartoon of a running horse. The visitor looks at this side of the disk by looking through the slots on the spinning disk while in front of a mirror. Also viewable are a spinning disk and a stream of water drops. By spinning the disk at the proper rate, the viewer can stop the motion of either.
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