Man has come a long way since he first came down from the trees and started to spend his time walking on the earth.
First he walked on all fours like most of the great apes.
As he began to stand upright he was able to start using his now free hands to carry things. At first you can see him carrying tools such as knives which he could use for hunting and fashioning weapons. Then spears, then moving into the rake as we take up a life of suburbia. The most recent tool of course is the computer.
Something, somewhere went terribly wrong
Man was constantly progressing upwards into a fully erect state, but then recently, we are again moving downwards.