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