The lapses in intuition mostly stemmed from the fact that the limit of an infinite statistical system has many zero-one laws which are absent in finite systems: an infinitesimal change in a parameter can lead to big differences in the statistical behavior, as Democritus expected.
— Wikipedia on Ising Model
2009.12.06 Sunday ACHK
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「原色」並非是一種物理概念，反倒是一種生物學的概念，是基於人的肉眼對於光線的生理作用。
有些物種的眼球具有四種不同的「感光體」，例如許多鳥類及有袋動物都屬於這類生物，甚至於有人提出部分女性人類的眼球也具有第四種感光體，除了紅綠藍之外還多了黃色。另一方面，大多數的哺乳動物都是屬於「雙色感光體生物」，牠們的眼球只有兩種感光體。
— 維基百科
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Primary colors are not a fundamental property of light but are often related to the physiological response of the eye to light.
Many birds and marsupials are tetrachromats, and it has been suggested that some human females are tetrachromats as well, having an extra variant version of the long-wave (L) cone type.
— Wikipedia on Primary color
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2009.12.06 Sunday
Physics Town 