Impossible Stairs
Free

The Penrose stairs, also known as the impossible staircase, is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop. Although the staircase is conceptually impossible, it does interfere with your perception since it looks like a person could climb forever and never get any higher. Watching the video is the easiest way to see how it works.

Build Instructions: https://www.instructables.com/...

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Impossible Stairs

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You can distribute, remix, adapt, and build upon the material in any medium or format, as long as attribution is given to the creator.

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stairs.stl
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