An analogue device to simulate the optical effects of nightfall.
An hourglass filled with black ink is flipped every 20 minutes. Over time, the ink slowly trickles from the top to the bottom, gradually dimming the light of a lamp positioned beneath it.
An hourglass filled with black ink is flipped every 20 minutes. Over time, the ink slowly trickles from the top to the bottom, gradually dimming the light of a lamp positioned beneath it.