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