abstract
age
annual
background
circle
circular
concentric
conceptual
cut
design
drawn
forest
fractal
growth
handcrafted
height
history
life
line
lumber
map
natural
nature
organic
ornament
pattern
plant
plywood
ring
ripple
rough
scheme
shape
slice
space
split
striped
stump
surface
texture
textured
timber
topographic
topography
tree
trunk
wood
wooden
years