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you can make a very delightful aquarium using this very simple technique. you need a transparency,
a card sheet, color pens and tape. take a doubled up transparency and stick some tape
so that you can paste a colorful picture of aquarium on top. shut across the transparency
and with a marker draw the outlines of the rocks, weeds and the fishes. if you open the
transparency you will see the aquarium with no outlines. if you shut it you will see the
fished, the rocks , the weeds with a dark outline.. take a doubled up card sheet and
make a slit near its open end. now place the transparency inside the card sheet. first
you sandwich the picture inside then place the transparency on top of the card. now if
you pull the transparency you see a delightful colorful aquarium if you push it in you just
see the dark outlines of the fish. you pull it out again you see the picture in all its
glory.