The step parts are foldable.

It can also be foldable

A ladder is taught which is foldable into an accordion position for storage.

twists and turns, bending and unbending would not be possible

The multipurpose case can prevent the core from being bent.

The leg arrangement (10) can also fold flat.

violation of the joints, so that they can not bend and unbend normally;

They chose to follow the devil rather than God, that's the issue.

This prevents the various legs of the shank from bending.

Application of different stimuli causes the actuator to bend and/or twist.

The bands are configured to flex in concert with the cup member.

A crossfold display can fold to a reduced footprint.

Shall we continue to use technology, or allow technology to use us?

The device can be rolled or folded and will easily fit into the user's pocket.

Forcing them to do stuff rather than letting them do stuff.