I want to build a shed, I approximate human height as 7 feet because it's a nice even number. I want some number of beams equally spaced nailed onto the posts,

I want to build a shed, I approximate human height as 7 feet because it's a nice even number. I want some number of beams equally spaced nailed onto the posts, I choose 4 posts because 3 and 4 are numbers people default to. 4 beams mean 3 spaces, 7/3=7x4 = 28inches. I nail the beams on every 28 inches. Can we agree that equally spacing 4 of something is a common operation? The metric example would be, 2 meters, divided by 3 = 0.333x2m = 0.666m But look at your tape measure and see which measurement is marked more promimently, an arbitrary centimeter precision measurement or an integer number of inches.