Who invented stairs? What is the oldest known example of stairs

Stairs and ladders were already in use by the time of proto-cities, so I'd guess they started outdoors as augmentations for difficult or significant trails

>>1109053
Nerd.

>>1109053
earlier than that. Foot delineation erosion on common paths.

>>1109260
That's almost a discovery, not an invention

>>1109049
They invent themselves. Walk up a solid slope a lot and your feet will carve steps.

>>1109332
The very concept of invention is specious. Read more history of science.

The concept.of stairs can be found in natural geological formations. It's technically a somewhat flat rock with another but higher somewhat flat rock next to it, making ascension possible.

We dind invent that, merely discovered it.