I think that I might have found the book it was in. I remember reading this with my grandma as a child and the picture beside the story of Mr. Nobody looked like a man with a square paper type of head and the legs were like accordion folded paper and there was turquoise blue shading below him and he was looking towards the right with his eyes, to see if anybody was watching. If I remember correctly I am pretty sure that the story or poem mister nobody mr. nobody mr nobody was in the Colliers Encyclopedia junior classics shelf of books freebie. My grandma had the encyclopedias sitting on the built ins around the fireplace and my mom was born in 1959 and my uncles were born in 51 and 55. I saw the books online at http://loganberrybooks.com/most-anthologies.html
and then looked on ebay and recognize the cover for the 1962 edition. I remember grandma trying to get me to read abc up but I much prefered the book with Mr. Nobody. Hope this bit of info helps!