Snowballs -- growing/shrinking lines

Today's post explores poetic structures called snowballs developed by the Oulipo (see also March 25 posting) and known to many through the writings of Scientific American columnist Martin Gardner (1914-2010).  TIME Magazine's issue for January 10, 1977 had an article entitled "Science:  Perverbs and Snowballs" that celebrated both Gardner and the inventive structures of the Oulipo. Oulipian Harry Mathews' "Liminal Poem" (to the right) is a snowball (growing and then melting) dedicated to Gardner.  The lines in Mathew's poem increase or decrease by one letter from line to line.   Below left, a poem by John Newman illustrates the growth-only snowball.