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