The switch from 'steam engines' to 'heat engines' signals the transition from engineering practice to theoretical science. - Hans Christian von Baeyer

If the intensity of the material world is plotted along the horizontal axis, and the response of the human mind is on the vertical, the relation between the two is represented by the logarithmic curve. Could this rule provide a clue to the relationship between the objective measure of information, and our subjective perception of it?

This is not what I thought physics was about when I started out: I learned that the idea is to explain nature in terms of clearly understood mathematical laws; but perhaps comparisons are the best we can hope for.

Entropy is not about speeds or positions of particles, the way temperature and pressure and volume are, but about our lack of information.