The Design Lesson
Published by Chris Coyier
I like these thoughts by Andy Rutledge:
In graphic design, nothing is what it actually is. Everything other than content is representative of something else.
A line isn't a line, it's a boundary. Don't need a boundary? Or is that boundary already clear by some other means? Don't use a line.
Same goes for boxes, gradients, white space, scale, font, and any other design element there is.