Scroll back down to the 1952 De Mers pieces I showed you on Tuesday and compare them to these three from 1962. What a difference a decade makes!
In Part 1 of his Illustration magazine article on the Cooper Studio, author Neil Shapiro quotes Don Crowley about a trend that emerged among the Cooper artists in the late 50's: "...they just weren't happy doing illustrations any more. They all wanted to be fine artists."
Perhaps here we are seeing De Mers' own exploration of illustration tinged with a fine arts approach.
These pieces can be seen at full size in my Joe De Mers Flickr set.