abut
adjacent
analogy
axis
balance
balance concept
beam
boulder
clog
cobble
compare
comparison
concept
concept design
conceptual
contiguous
counterbalance
design ideas
differ
equality and diversity
equilibrium
equivalence
evenness
flat
gravity
harmony
heaviness
idea
isolated
joint
nature
next
notion
object
parallel
parity
pebble
rock
scale
simile
similitude
simplicity
space
stability
stone
symbol
symmetric
thought
weight
white