On one of my walls I have a large piece of clear contac paper,
sticky side out, adhered with a frame of colorful masking tape.
Whenever students find something wonderful (they supply their own
definition of wonderful), they just place it on the "sticky
collage." It looks great right now and, by the end of the year, we
will have completed quite a masterpiece! It also helps during clean-
up, considering the many 'treasures' on my floor.
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Enjoy,