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There is no general reason to expect evolution to be progressive – even in the weak, value-neutral sense. There will be times when increased size of some organ is favoured and other times when decreased size is favoured. Most of the time, average-sized individuals will be favoured in the population and both extremes will be penalised. During these times the population exhibits evolutionary stasis (i.e., no change) with respect to the factor being measured. If we had a complete fossil record and looked for trends in some particular dimension, such as leg length, we would expect to see periods of no change alternating with fitful continuations or reversals in direction – like a weathervane in changeable, gusty weather.

 

Richard Dawkins

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The history of most fossil species includes two features particularly inconsistent with gradualism: 1. Stasis. Most species exhibit no directional change during their tenure on earth. They appear in the fossil record looking much the same as when they disappear; morphological change is usually limited and directionless. 2. Sudden appearance. In any local area, a species does not arise gradually by the steady transformation of its ancestors; it appears all at once and “fully formed.”

 

Stephen Jay Gould

 

One person talks day in and day out in general assemblies and always about what the times demand, yet not repetitiously in a Cato-like, tedious way, but always interestingly and intriguingly he follows the moment and never says the same thing; at parties, too, he imposes himself and doles out his fund of eloquence, at times with full even measure, at times heaped up, and always to applause; at least once a week there is something about him in the newspaper; also at night he bestows his favors, on his wife, that is, by talking even in his sleep about the demands of the times as if he were at the general assembly. Another person is silent before he speaks and goes so far that he does not speak at all; they live the same length of time-and here the question of the result is raised: Who has more to recollect?

 

Soren Aabye Kierkegaard

 

Yet actual physical size has an emotional meaning. We relate everything to our own size, and our emotional response to size is controlled by the fact that men on the average are between five and six feet high.. ..If practical considerations allowed me, cost of material, of transport, etc., I should like to work on large carvings more often than I do. The average in-between size does not disconnect an idea enough from prosaic everyday life. The very small or the very big (sculpture, fh) takes on an added size emotion.

 

Henry Moore

 

If, however, one factor is too successful, it will continue to be the winning factor regardless of the variation in the other factors over the range of variation in the conditions, and therefore will stifle the development of other advantageous factors until the conditions change sufficiently that it no longer is the winning factor. At this point, the whole population is ill prepared for the change, and may well perish entirely if the winning factor accidentally becomes the matching factor for a disease or a predator.

 

Erik Naggum

 

Since 1965 [....] the richest fifth of the world's population increased its average income by 75 percent. For the poorest fifth of the world's population, the increase has been faster still, with average incomes more than doubling during the same period.

 

Johan Norberg