The answer is "stacks." That is the object of the phrase, and since a person is searching for something ON the shelf, they aren't searching for the shelf itself.
The road least taken by robert frost
I think this is the Rising action
beacsue they want to make it a mystery
they want the audience to think about it
kind of like a rhetorical question
except this is not a question
Without the proper equipment safety damage to the bone, muscle, and ligiments known as "Over Use Injuries" can occur
