where do you spot line of sight from? center to center? or 2 corners to 1 corner?

[Joel BoardgameRpger <joel.siragher@gmail.com>]

I tried an intro to TFT but since i havent played it in a couple years forgot how its played. 

where do  you spot line of sight from? center to center? or 2 corners to 1 corner(decent reference)? 

new rules and old rules?

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Any person whose character traits all fall in the center, midway between the extremes, is considered wise. - RAMBAM

Do not go gentle into that good night, Old age should burn and rave at close of day; Rage, rage against the dying of the light. -Dylan Thomas.

These two thoughts are not mutually exclusive -JDS