a window that uses sand instead of blinds

I found a window that works like an hourglass. It was developed by a Mexican company and presents a simple but at the same time original solution.

This prototype is from the Mexican architecture firm Álvaro Ramírez + Arquitectos.

A window design that uses sand instead of shutters.

In the video you can see it in action:

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Wouldn’t it be great if, instead of using blinds, your window was filled with sand, and you could somehow fill and undo the sand when you wanted the window to be blocked or released?

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