"Sand Glass" Moving Sand Art Picture. Dynamic Desktop Decor, CURIOS FOR THE CURIOUS

CURIOS FOR THE CURIOUS [176b]: "Sand Glass" Moving Sand Art Picture. Dynamic Desktop Decor

Wikipedia chapter on Sand Art, Sand Glass : https://en.wikipedia.org/wiki/Sand_art_and_play#Other

Wikipedia article on : https://en.wikipedia.org/wiki/Surface_tension

Wikipedia article on Couette flow : https://en.wikipedia.org/wiki/Couette_flow

Wikipedia article on Darcy's law : https://en.wikipedia.org/wiki/Darcy%27s_law

Wikipedia article on Hagen–Poiseuille equation : https://en.wikipedia.org/wiki/Hagen%E2%80%93Poiseuille_equation

Wikipedia article on Laminar flow : https://en.wikipedia.org/wiki/Laminar_flow

Wikipedia article on Shell balance : https://en.wikipedia.org/wiki/Shell_balance