abstract

animated

animation

art

attention

backdrop

background

black

caution

danger

design

effect

escher

geometric

geometry

graphic

hazard

hole

hypnotic

illusion

impossible

loop

looping

motion

moving

optic

optical

pattern

psychedelic

radial

round

safety

seamless

security

spin

spiral

strip

stripe

swirl

texture

tunnel

twist

wall

wallpaper

warning

warp

wave

wavy

yellow