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: Homemade Jacobs Ladder – Link.