h a l f b a k e r y
The word "How?" springs to mind at this point.
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||about mid page at the link there is a fluorescent slinky.
fiber optic even better
||great idea but passing coloured light through a fiberoptic
slinky may trigger a rotational frame-dragging space-time
phenomena... do try hard not to become a 'Rip Van-winkle
of the stairs'.
||Gr. "rotational frame-dragging space-time phenomenon"