> As pointed out by Don Norman in "The Design of Everyday Things", any
> device as simple and obvious as a door, that requires an instruction
> manual (even a one word instruction manual, 'Push' or 'Pull') is a
> failure in design.  When a door handle is a horizontal bar, the natural
> impulse is to push on it; a vertical bar naturally implies grasping and


What about signs on exit doors that say "DO NOT ENTER"....?
Are they telling me I shouldnt' have come in in the first place?

Maybe they should say "Not an Exit".


Here's another popular design flunk.
A rectangular, large-ish device, with a flat top, that says not to put
anything on top of it.
If it's big and flat, people are going to put stuff on it.   Rounding the
top will make that not work.