"It requires a certain kind of mind to see beauty in a hamburger bun. Yet is it any more unusual to find grace in the texture and softly carved silhouette of a bun than to reflect lovingly on the hackles of a fishing fly? Or the arrangements and textures on a butterfly's wing? Not if you are a McDonalds's man."

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Many instructional arrangements seem "contrived," but there is nothing wrong with that. It is the teacher's function to contrive conditions under which students learn. It has always been the task of formal education to set up behavior which would prove useful or enjoyable later in a student's life.

— B. F. Skinner