On: Expanding Racks [video]

[mitthrowaway2]

A similar mind-bending idea is the helical band actuator:

https://en.m.wikipedia.org/wiki/Helical_band_actuator

https://www.pacospiralift.com/solutions/spiralift-solutions/

[Gravityloss → mitthrowaway2]

Thanks, this is the mind-bendiest of them all, had never heard about it!