4point
abstract
angle
background
basic
black white
blank
block
blockage
box
brick
contrast
cube
geometric
geometry
gradient
gray
grayscale
grey
greyscale
interlock
intersect
layer
level
minimal
multilayered
multiple
multitier
overlap
overlay
position
quad
quadrangle
quadrate
rectangle
rectangular
regular
series
shape
simple
square
stack
structure
tier
tile
variation