They hilariously emphasize just how poor our basic understanding of simple mechanics really is. Gimini, who has collected hundreds of bike drawings, says people tend to get the same things wrong ...

Go grab a pen and some paper and try this: Using only your memory, draw a bicycle. You have two minutes. Gianluca Gimini has over the past six years asked more than 500 people to do exactly this.

You know what a bicycle looks like... right? Two wheels, handlebars, pedals, some crossbars. But get a piece of paper and try to draw one exactly, you might be surprised at the results.