I was looking outside of the window and got an idea "All tools human use seems to be strangely fit for our size. Buildings, cars, various power tools. All of them are have good size for humans that are 1.5-2m in height." But is that really true?
How would human society, tools, buildings or machines look like if humans were much smaller or shorter. Lets say 1m or 0.5m . Would the buildings or machines be just scaled down or are there any mechanical or technical issues that would need to be handled when fitting them to smaller humans? Or how would such smaller species of humans develop? Would it same as current humans or would there be any differences?