Urgh, ffs. You don't know when to admit you're wrong, do you?

A computer mouse is intuitive, for example, but that doesn't mean "you don't need to learn it". You need to learn the mouse only works in two dimensions, for instance (ever see someone move a mouse physically in the air, thinking the mouse pointer would move up?).

You need to learn there's no absolute direction to the mouse, even in two dimensions (ever see someone grab a hockey puck mouse the wrong way?).

You need to learn what happens when you move the mouse from A to B, pick it up from the table, move it back to A and continue moving (compare and contrast to the way a Wacom tablet works).

Seriously. What Stingray #88 said.