I made this electronic art piece in the early 1980’s inspired by a sound only version in a local art gallery.
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This has a variety of circuits to flash the 50 or so LEDs in various ways. There are 3 mercury switches to sense the position of the pyramid which can be tipped with any of the 3 apices up with different results. It turns on in response to decreasing ambient light intensity hence will turn on as you approach. The actual light intensity controls the flash rate.

It ‘plays’ electronic sounds and also has a door bell chime chip to play 24 tunes in sequence as one of the options. There are no printed circuit boards and all wiring is point to point and supported by the inner and outer pyramids which are also the supply rails.

Related pages

  Flashing glasses

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Photo Date: 2011