I am trying to think of a few things that sound like they could be made of concrete but really can’t.
All of the things below can be made of concrete and I am looking for realistic (but false) choices for the other spaces.
___ swimming pools
___ driveways
___
___ silos
___canoes
___
underware
A balloon!
cargo ships
pampers. . . well you could. . . but i wouldn’t
Plane, toothbrush, a pet, food, shoes, couch
Tree houses
hammocks
pup tents
balloons
hot air balloon
glasses, bras, watches, etc. . . .