kaleidoscope is for 12th graders??
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https://www.meritnation.com/ask-answer/question/how-to-make-a-kaleidoscope/light-shadows-and-reflection/5400263
https://www.meritnation.com/ask-answer/question/what-is-kaleidoscope-explain-its-working/light/477526
https://www.meritnation.com/ask-answer/question/how-to-make-a-kaleidoscope/light-shadows-and-reflection/5400263