On Convergent Evolution

[sdi]

Okay, okay, one last cute thing and I'm done for the night.

Geomancy (that is, "earth divination") is built upon the repeated use of the logical XOR operation. In computer science, the symbol for XOR is usually rendered as a plus inside of a circle: ⊕. (This is because XOR is addition that loops back on itself instead of carrying into the next place.) This happens to be suspiciously similar to the modern astronomical symbol for the earth: ⨁. (This is supposed to represent a globe crossed by the equator and a meridian.)