"Through a process of trial and error and experimentation, I discovered the simplest method - using only black - produced work with the strongest visual impact installed."

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[Coining phrase "null hypothesis"] In relation to any experiment we may speak of this hypothesis as the "null hypothesis," and it should be noted that the null hypothesis is never proved or established, but is possibly disproved, in the course of experimentation. Every experiment may be said to exist only in order to give the facts a chance of disproving the null hypothesis.

— Ronald Fisher