abstract
array
black
bullseye
burst
center
centre
centric
centrifuge
circle
circular
concentric
conflux
converging
curve
emission
epicenter
epicentre
geometric
grayscale
hypnosis
hypnotic
hypnotism
illusion
impact
merging
midpoint
minimal
monocrome
pattern
radial
radiate
radiating
radiation
radius
repetition
ring
ripple
shape
shockwave
signal
simple
sonar
spiral
swirl
vibration
visual
whirl
white