'progression' the earliest extant of my works to utilize the metaphoric relationship, 'progression' actually was a result of a mistake which was covered over by what became one of my best known creations - the onion tree... as can be readily discerned, the theme/title is very much a cliche, tho the particular way it was done has originality in it to some extent... one of my regrets is that I never played up on this, since there was a host of related visuals which could have used that tree, and extentions of that theme/titling...