Comment by pbronez

There are a lot of structural details that people tend to gloss over. This was illustrated by an Italian art project:

https://www.gianlucagimini.it/portfolio-item/velocipedia/

> back in 2009 I began pestering friends and random strangers. I would walk up to them with a pen and a sheet of paper asking that they immediately draw me a men’s bicycle, by heart. Soon I found out that when confronted with this odd request most people have a very hard time remembering exactly how a bike is made.