[Symmetry]

Moore's diagram's in his origonal paper, presumably. However, while he only plotted a few data points he presumably used his experience with the semi-conductor industry in general and so actually had more.

ftp://download.intel.com/museum/Moores_Law/Articles-Press_Releases/Gordon_Moore_1965_Article.pdf

[edge17]

most industry insiders will tell you that Moore's law is a marketing law that drives timelines more than anything else.

sure he used his experience, but CEO's have also been known to make wild and extravagant statements :)