abstract
arc
asymmetry
back
backdrop
background
black
burst
bw
cercle
circle
circular
collection
colorless
converging
density
distortion
drop
dynamic
geometric
graphic
grayscale
greyscale
illustration
irregular
lines
minimal
misc
miscellaneous
monochrome
monocrome
optical
patern
pattern
radial
radiating
rings
ripple
round
set
simple
simplicity
square
subtle
texture
thin
uncolored
visual
wave