This week's puzzle is a practical one; you can solve it with pen and paper, but it's a lot more fun to try this real-world phenomenon for yourself.

## Sunday Puzzle #14: How Much Of Yourself Can You See In A Mirror?

Imagine you are standing before a small wall-mirror. This is no funhouse mirror; it is perfectly flat, and mounted flush with the vertical wall on which it hangs. How much of yourself do you see in the mirror? What if you take a few steps backward, away from the mirror? Can you see more of yourself? Less of yourself? How big of a mirror would you need to see your entire head reflected back at you, at a given distance? How big of a mirror would you need to see your entire body reflected back at you? (Bear in mind: The mirror depicted in the art at the top of this post has not been drawn to scale.)

We'll be back next week with the solution â€“ and a new puzzle! Got a great brainteaser, original or otherwise, that you'd like to see featured? E-mail me with your recommendations. (Be sure to include "Sunday Puzzle" in the subject line.)

UPDATE: The solution to this puzzle has been posted here.

Art by Tara Jacoby

## SOLUTION To Sunday Puzzle #13: Mathematical Poetry

Last week, I showed you the following mathematical equation. Said equation is already balanced; the quantity on both sides of the equals sign is 81:

What's interesting about this equation, however, isn't that it's balanced, but what it sounds like when read aloud. This expression, it turns out, is a mathematical limerick. When read aloud, it matches the rhyme scheme of a five-line limerick. (AABBA). But there's a bit of a twist.