But when you took the files home, you still had to put them on a floppy disk. I'm not sure. I don't understand the briefcase. I could never get it to work. Affordances Well-designed objects make it clear how they work just by looking at them.
Some doors have big metal plates at arm-level.
The only thing you can do to a metal plate is push it. In the words of Donald Norman , the plate affords pushing. Other doors have big, rounded handles that just make you want to pull them. They even imply how they want you to place your hand on the handle. The handle affords pulling.