Bizarre classroom posters from the '70s, Part 3: Behold the roots of memes

It may be spring break for some students, but the rest of us are headed back to class -- way back to the 1970s, when discussion posters like these were created to prompt conversations (and confusion). Our first batch of rare finds featured captions. This one -- from the same set as our mind-warping second collection -- is sans words, so we've added our own captions. Feel free to do likewise: These strangely gorgeous illustrations are like 21st century memes decades before their time. Check them out below. Page down to see more bizarre '70s discussion posters!