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make rainbow colors
take a card sheet
with three overlapping windows
apply glue around the windows
stick transparent colored papers over them
now you can take it outside
if you fold the blue
on the yellow window
what do you see
green
now if you shut blue on the red window
you see purple
and now
if you do
yellow on red
you will see
orange
now if you want to make a multicolored flower
you can take two of these
discs
with colored windows and
fix them with a press button
now if you turn the discs
one against the other
you have a beautiful multicolored flower