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The activists also decorated the valve handwheel with sunflowers, and some attached themselves to the wheel with superglue and chains, the organisation said.

It began where a spoked handwheel, rusted red, had been pressed into the dirt as if it were a sundial, a clock, stopped.

The façade’s sliding sun screens, made of a locally produced recycled-paper-based material called Richlite, mimic boxcar doors and can be opened and closed with a giant handwheel.

Note that its machine gun was removed, though the turret still could be manipulated, creakily, via a handwheel within.

The large handwheel H and a corresponding wheel on the opposite side are used for adjusting the spindle rapidly by hand.