Jacob1
Jeremiah writes –

The blocks in his ladder are 12-gauge steel sheets forged to put a bend in them, secured with used bicycle chains obtained from local bike shops. The base is a large metal gear found at a scrap and salvage yard. A wheel crank located at the top of the sculpture, also from a scrap yard, turns the steel blocks.

Thingamababy: Show and Tell: Jacob’s Ladder as a 12-Gauge Steel Sculpture – [via] Link.

Related:
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Homemade Jacobs Ladder – Link.