64
The number of days per week is a prime number...
(reddthat.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Dividing things neatly appeals to some part of the human brain that appreciates order and structures. There’s a certain type of beauty in it. However, when you’re actually measuring, cutting and building stuff, you end up with really messy values, as you are dealing with harsh reality instead of some ideal fantasy.
Building also ends up weird because the size was based on what ancient Romans did which obviously wasn't based on any modern system.