Our readingWhat is a korrent?
Detail a symbol could technically carry still costs you, because it distracts from the instant recognition the symbol exists for.
Drawn from what Susan Kare said
What these subjects mean
design How things should be made and judged: what makes a design good, who should do the designing, and what an interface is for.
simplicity Less, but better: reduction as the way to make something good, and the argument about when it goes too far.