Alan Kay thought computer users were hopelessly corrupted by the systems they were forced to use. But then, his Smalltalk used a three-button mouse. from the room 
Ward Cunningham remembers explaining the logic of the buttons to computer science researchers over and over: > I worked with a particle physicist who could not understand Smalltalk's three levels of operator precedence. I made him a little sign like you might find in a restaurant announcing new features on the menu. It said 1) messages, 2) binary operators, 3) compound keyword messages. > > By this rule `+` and `*` had the same precedence. That is what threw him off. Too much physics, that guy. > > Of course in Smalltalk `+` and `*` were interpreted by the objects present and might not have anything to do with addition or multiplication. I miss that guy. He was brilliant in every other way.