That’s very cool. There’s a science museum in Sudbury Ontario that has something pretty much identical to this, albeit with slightly less cool colouring. Beside it was a sand table that projected the topography of the sand. Both were so awesome to play with. My youngest kept wanting to bring the blocks to the sand table to make buildings.
A small thought: if your hand affects the flow and it seems cool, add a small fan to simulate the blowing and see if that has a meaningful impact on the sensation of the experience.
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