What is this?
tree trunk
nest
beaver dam
arch
What is this?
bridge
pillar
cave
arch
What is this?
skeleton
cave
eggshell ( shell )
nest
What is this?
arch
nest
cave
beaver dam
What is this?
tree trunk
shell
skeleton
ladder
What is this?
castle
stairs
basket
ladder
What is this?
castle
bridge
arch
ladder
What are these?
ladder
bridge
pillar
stairs
What is this?
castle
stairs
arch
pillar (column)
What is this?
pillar (column)
castle
bridge
arch
What is this?
bridge
arch
house
castle
What is this?
tree branch
tree root
tree trunk
tree house
What is this?
cave
shell
nest
eggshell
What is this?
book
basket
bag
box
What is this?
bag
box
book
basket
What is this?
pillar (column)
tent
cave
arch
