describe the man from the fringes. How did he deviate

From the text:

He stood some eighteen inches taller than anyone else, but not because he was a big man. If his legs had been right, he would have stood no taller than my father's five-feet-ten; but they were not: they were monstrously long and thin, and his arms were long and thin, too. It made him look half-man, half-spider. . . .