abstract
amorphous
asymmetry
billowy
black
chaos
chaotic
crisscross
curly
curve
curvy
dense
density
form
formation
freeform
geometric
geometry
graphic
grayscale
illustration
irregular
line
linear
loop
messy
minimalism
minimalist
nonfigural
optical
overlap
random
randomness
ripple
smooth
snaky
squiggle
squiggly
swirl
tangled
undulating
visual
waveform
wavelike
wiggle
wiggly
wriggle
wriggly
writhing