So I googeled "visual puns" and I found links to pages of them....... Is that punny?
I also want to toss in a plug for a pretty good book about humor and puns. James Geary's "Wit's End: What Wit Is, How It Works, and Why We Need It". I think I learned of this book from a thread here on Cake
You might even find the answer to why cannibals don't eat clowns.....😜