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What is it? I’d like to know!

Had this for many years but what is it? There are thousands of little ball bearings, sandwiched between the two clear and solid plastic sides. Shaking it produces different patterns but.......what is it? It is only about 5cm square.

 

Clues? Chemistry, geology, education but anything more will reveal too much.

Answer tonight sometime!

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Uploaded on March 2, 2021
Taken on March 2, 2021