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The “Spiral Sunrise” by Esther Polak visualizes the sun’s rising and setting through a solar-powered robot that is tethered to a tree and moves in circular rings around the tree. The robot carries an open sandglass so that when it moves, it draws a line of sand and the thickness of the line depends on the speed the robot is moving. Interesting way to show patterns of sunlight over the course of a day.

Spiral Sunrise – Media Lab Prado