"A door: defined as an opening in a wall. Where there exists no wall that may be opened, there can, ipso facto, exist no door. On the other hand --"

As he mulls aloud over the semantics, Grantaire has been backing along up along the length of the string; now he puts out a hand to tug it, experimentally.

He meets no resistance, and, therefore, the action is perhaps more powerful than intended. Either way, the string drops in his hand, the end trailing limply into the dusty ground.

Grantaire stares at it, effectively distracted from whatever incoherent point about doors he was about to make.