Also consider for a minute how blindingly obvious it is, in retrospect, to know that containers can -- and should -- be stacked 3+ high vs. how hard it is to walk into a field of 2-stacks and know that they're being stacked inefficiently. Part of the challenge is informational: those that see the problem see it so obviously that they assume that there's a reason why the problem can't be fixed. Those that can't see the problem don't even realize there is a problem!
