What makes a "pretty" snake?

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What makes a pattern pretty or ugly? It is it in the eye of the beholder, or is there something scientific to it?

Right now, it's completely in the eye of the beholder, which I personally find to be a detriment to the overall market, and a majority of the reason the prices and quality are virtually unchecked.

I'm personally betting on the fact that, in the very near future, the larger breeders will start assembling books on what makes a pretty snake vs. what makes an ugly snake (much like dog breeding specifications published by the AKC), and the prices for snakes will stabilize along stratified lines based on the quality, instead of the simple genetic possessions, of the animal.