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Time for Play: Colored Glue Suncatchers. This whole blog is filled with great ideas for fun learning through play activities with preschool children. A lot of them are messy!
Just from the picture and from a few other things I saw today using needlepoint hoops, I think I could use wax paper, hoops and leaves and pressed flowers for this. The Montessori site this links to did not have this activity shown.