abstract
abstraction
artistic
background
black
burst
bursting
circular
converging
curl
curve
distorted
distortion
eddy
graphic
graphical
helix
hypnotic
illustration
lines
misc
miscellaneous
monochromatic
monochrome
optical
perception
radial
radiating
red
rotating
rotation
spiral
swirl
torsion
twirl
twist
visual
volute
vortex
warp
whirl
whirlpool
white