I don’t follow Olivia Jaimes’s Nancy comics often but the ones I catch are always really clever and this is no exception. The comic from 14th August plays on self-reference and the power of comprehension with something as simple as a jigsaw puzzle. You’ll need to read it a few times to get it.
And as Jason Kottke pointed out, this isn’t the first time Jaimes flipped the script so to speak:

This is the part where I subscribe to Nancy on Go Comics.