Research shows that there is only half as much variation in student achievement between schools as there is among classrooms in the same school. If you want your child to get the best education possible, it is actually more important to get him assigned to a great teacher than to a great school.
In my teaching, I try to expose my students to the widest range of aesthetic possibilities, so I'll offer them stories from Anton Chekhov to Denis Johnson, from Flannery O'Connor to A.M. Homes, and perhaps investigating all that strange variation of beauty has rubbed off on me. Or perhaps that's why I enjoy teaching literature.
The older the layers, the more each of them is uniform over a great extent; the newer the layers, the more they are limited and subject to variation within small distances.
An aria in an opera - Handel's 'Ombra mai fu,' for example - gets along with an incredibly small number of words and ideas and a large amount of variation and repetition. That's the beauty of it. It's not taxing to the listener's intelligence because if you haven't heard it the first time round, it'll come around again.
If you look at any leaf on any tree branch, it's similar to but not exactly a repetition of the previous branch. So the new science of complexity or showing how an architecture can be produced just as quickly, cheaply and efficiently by using computer production methods to get the slight variation, the self-similarity.
If you look at music, you see theme, variation, you see symmetry, asymmetry, you see structure, and these are related to skills in the real world.
You can open up a centenarian's brain, and you'll see some areas that look like that of a 50-year-old or of a 110-year-old. You can have variation in the basic process of aging, called senescence, in different parts of the same body.
In skating there's always another jump or another spin variation or another thing to learn, and that's what I liked about it.
In stating the principles which regulate exchangeable value and price, we should carefully distinguish between those variations which belong to the commodity itself, and those which are occasioned by a variation in the medium in which value is estimated, or price expressed.
I believe the earth's climate is changing, but I think it's changing for natural variation reasons and I think mankind has been adapting to climate as long as man has walked the earth.