Experimental fiction and more rats

OK --- I just got some good advice from a couple of people about my experimental fiction. Make it longer. That makes sense -- the piece is very, very short. Nothing happens. The question is --- how do I make it longer? It's hard to lengthen something that is virtually plotless, but my writing professor and two of my fellow students gave me the same advice. Also, you wouldn't believe the rat I saw yesterday at the corner or Broadway and 125th. It ran out of the street, collided with some guy's shoe, and then raced right back out into traffic! I hope the rat is OK. (Live in this city long enough and you start sympathizing with everyone who shares space with you, even vermin.)