From a study project  this concept developed after several very different stages of evolution.

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On the one hand, it is a training device for at home to do pull-ups or dibs without requiring a permanent installation in the apartment.

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But it can also be used as a ladder (every household needs a ladder!). 

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The third function comes into its own in the "clean" state.

With the sympathetic choice of shape and material, you don't perceive it as a "folded ladder", but as part of the living space. It can also be used as a storage location  for textiles.