abstract
angular
arc
art
artistic
black
burst
centripetal
circle
circular
circulation
concentric
curl
curve
cycle
cyclic
distortion
eddy
effect
element
geometric
geometry
grayscale
greyscale
helix
illustration
loop
monochrome
monocrome
rotary
rotating
rotation
round
shape
spinning
spiral
square
swirl
sworl
torsion
twirl
twist
volute
vortex
whirl
whirligig
whirlpool
white
whorl