Read the passage from Nausea:
p.10- paragraph begining so today...
p. 20, paragraph begining, the cards fall.
Note how Roquentin describes the sensory details of things just as he experinces them, somewhat divested of the meaning normally attached to them. Describe in sensory detail a common experince (eg. a meal, watching someone do something, a game) focusing only on how it appears to you and divorced from the context that normally gives what you're observing its significance.