3D entertainment is nothing new. The View-Master, the stereopticon, and even in movies (where it hits us now) and comic books of the 1950's.
I'm guessing this is a pretty rare re-printing of this story, as so much of Mad's history has it's re-prints in black and white, but when Harvey Kurtzman and the fantastic Wally Wood took this on in 1954 for "Mad" (THE COMIC BOOK), re-prints were farthest for their minds.
Anyway, let's dig on in to "Mad Monday" and dig on "3-Dimensions!". Get yer glasses on, kiddoes!
Talk to you soon.