abstract
black
bw
centric
centrifuge
circular
coil
colorless
distortion
eddy
element
graphic
grayscale
greyscale
gyration
gyre
helix
illustration
lines
minimal
misc
miscellaneous
monochrome
monocrome
optical
periodic
revolved
roll
rotary
rotating
rotation
shape
snail
spiral
spire
swirl
torsion
twirl
twist
uncolored
visual
volute
vortex
whirl
whirlpool
white
whorl