"The vocabulary or the language of aesthetics.
order
unity
variety
contrast
symmetry
asymmetry
rhythm
harmony
disonance
rhyme
interval
regularity
coherence
tension
balance
proportions
scale
weight
texture
line
mass
space
shape
light
shade and
color
When you talk about form this is what you're talking about. and that's why form has nothing to do with style."
From an interview with Paul Rand.