What makes something simple, complicated, and/or complex?

A wooden staircase, viewed from below — Emma's Staircase
Photo: Emma Stellman
A spiral staircase viewed from the bottom looking up
Photo: Petar Milošević
An illustrated Penrose staircase by Sketchplanations
Image: Jono Hey, Sketchplanations

Do all 3 images of staircases have aspects of complexity?

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