The bro is part of the artwork.
Here, we're sure the right thing to do is not to tell him. Creating a piece of art using plastic cups and your unknown, sleeping friend is pretty hilarious. However, we can see this ending badly and abruptly when this guy suddenly wakes up and jolts up in dazed confusion.
Good thing someone snapped a picture, so at least the patient effort of the artists to put together this masterpiece wasn't all for nothing.
