Some things really are easier shown than said. Here's an uber-concise graphical 'proof' of the famous identity
\[
\sum_{i=1}^{n}i^{2}=\dfrac{n\left(n+1\right)\left(2n+1\right)}{6}
\]
(For those unfamiliar with \(\Sigma\) notation, here's a quick explanation. Trust me, it's not as scary as it looks!)
