This mass of flesh in the wheelchair - obese, constricted, imperfect - is Chris Johnson's body. It is, he says, "his monster." It's a cruel joke of Mother Nature, explained in words such as "cerebral palsy" and delivered in humorless punch lines that, instead of laughter, can leave him lonely, melancholy and despairing.Chris Johnson knows them all. But know this about Johnson - the brain damage that he experienced at birth 30 years ago relegated his body to a wheelchair but did not limit the boundaries of his mind.As proof, he will roll across the stage May 22 at Augustana College's commencement ceremony, a double major in French and English with a 3.95 grade-point average and a story of inspiration.