DIY Kaleidoscope
How to Make a Teleidoscope (a type of DIY Kaleidoscope): https://babbledabbledo.com/mini-diy-kaleidoscopes-open-ended/
How to Make a Kaleidoscope: https://buggyandbuddy.com/science-for-kids-how-to-make-a-kaleidoscope/
DIY Kaleidoscope: https://www.thatswhatchesaid.net/diy-kaleidoscope/
Alufólia vagy
https://autofejlesztes.hu/univerzalis-vaghato-tukorlap-253-x-178-mm-65558-af101067