I love this cover for a fictional (as in does-not-exist fictional) book from comic artist Lucas Adams. Sort of an existential nihilist kids' book -- my favorite kind!
With a little Googling, I was able to find an actual maze for kids that's unsolvable. Apparently it appeared on the back of a Curious George book years ago:
Seems like a great parent-child conversation starter!
I ran across the fictional maze book on The Rumpus, by the way.