Let's
Start:
Print
out the models below and paste them on to a cardboard,
then cut out the discs.
Take
one of the models, push a pointed short pencil through
its centre.
Hold
the top of the pencil lightly, spin the disc and then let
go.
Observe
and discover:
You'll
notice that the rotating discs give intermittent stimulation
to color receptors in the eye, and so producing a subjective
color illusion. Try them and send us your comments!