Our psyche, emotions, character, would be very different if we could walk on four legs.
If true what Charles Darwin thought, humans are modified monkeys. Therefore, shoulder part of the point: WE ARE APES, ie monkeys.
We have great similarities but there is something that filled our lives with simple, lost support in all four legs. Would feel much safer if we had the full support!, We would avoid much anguish!, How reassuring balance would feel better with a distributed database support (on all four legs)!
Mental consequences of having a good support are hardly imaginable. Or rather, almost never think that we are so vulnerable because we have such a small (foot) base.
Of course, with this vertical design, we have hands to do things, to grab something if we fall, to build solutions that compensate our instability.
In fact also gain the ability to watch: as we have eyes located in a high place we can see farther than other animals that have eyes closer to the ground.
But my professional bias, (I 'm a psychologist), I think much predisposes affective emotional, intellectual. If you walk in four legs would feel safer and we would not be so aggressive, suspicious, violent. If we had eyes closer to the ground, we would not be so arrogant as to look at other animals as inferior.
In short, we won and we lost. You are now : we can not go back. Continue to feel this fear of falling, caused because we have a rather inefficient base. We fear falling into temptations, in economic ruin, in disease and a grave, of course.
Note: Original in Spanish (without translation by Google): La inestabilidad humana.
(Este es el Artículo Nº 2.121)