back in the day, during a talk about Westinghouse, we were all admiring Rand's striking and iconic Westinghouse Logo, the theory and precision behind it.
A little boy pointed at it and said "That logo is dumb."
And it was at that instant that we all suddenly realized that it was a pretty bad logo. We moved on to the next topic quickly after that.
I feel like the difference between art and design is that you shouldn't need to know any of the back story for design, it should just look right, even if the lay person can't quite tell you why it looks right. Nobody needs the backstory on the Nike tick. You don't need to be told that the lines on the FedEx logo are beautifully balanced.