In top left is an illustration of two non-arbitrary languages. The one on the left represents mathematics and is evaluates to the negative integer -1. See http://www.math.toronto.edu/mathnet/questionCorner/epii.html or more information. The one on the right represents music and is just a piece of musical score, an illustration taken from the Wikimedia Commons, as are all images which were put together to make this header.
Also on the left, below the math and music pieces, is a table such as used by linguists in studying a Chinese dialect. It shows Sinthetic Naxi language tones, comparing differents orthography used by Naxi language scholars.
In the center is an illustration of the vowel formant patterns for the Canadian Pacific Southwest (Vancouver) and the US Pacific Northwest (Seattle). The F1 (lower) format is on the y-axis, the F2 (higher) format is along the x-axis. The usual phonetic symbols are used.
On the right is a world languages map. The key is below:
Key to Language Map
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