This improv game is in the following improv game categories:
Good exercise on object work: players in pairs. First player builds an object,
as precise and careful as possible, then hands it over to the other. Second
player accepts the object, being as truthfull to what the first player built
as possible. After having acknowledged this, player 2 starts morphing the
object into something else. This can be done by bending, breaking, twisting,
you name it. When the new object is complete it gets
passed back to player 1, who accepts and then morphs it.
You can do this in a circle, passing and morphing objects around the circle.