abstract
abstraction
amorphous
artistic
centrifuge
circular
concentric
cyclic
design
distort
distortion
figure
formation
freeform
geometric
geometrical
geometry
gyration
harms
irregular
minimal
misc
miscellaneous
monochrome
motif
nonfigural
op
op art
opart
optical
radial
shape
torsion
unusual
visual
vortex
whirlpool