There is a mathematics book from the 19th century that proves all Euclidean theorems using shapes and colours as nouns. Running on the rain is an exercise on visual rhetoric.

The question itself is a popular saying that states that if you run under the rain you will get more wet than if you walk. This may be true, but you also get home faster. So the question is: is it worth running in the rain?

The insight was to represent all variables in this equation graphically. Speed, distance from home and even how much water you get per second are drawn as lines of constant sizes. This way time could be calculated geometrically. The total amount of water is finally calculated as an area, and by comparing those areas one can reach the final (and rather obvious) conclusion:
If you’re surprised by rain, run.

Information from wanderingabout.com

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