All Hail Eris!
All Hail Discordia!
The discordians call this the law of fives (2+3=5), they say that every number is in some way directly or indirectly related to the number five. The law of fives is a metaphor for how the human mind sees patterns and order everwhere, even in places where there is no order.
Basically this is the idea behind the idea of the number 23 appearing everywhere. If you expect to see 23 everywhere you look you will see 23 everywhere you look.
(In other words, what Li10 and Genkai said)