Illustration

Gravitation: The tendency of all bodies to approach one another with a strength proportion to the quantity of matter they contain --the quantity of matter they contain being ascertained by the strength of their tendency to approach one another. This is a lovely and edifying illustration of how science, having made A the proof of B, makes B the proof of A.

I don't think there's an illustrator who's as good as a Titian or a Rembrandt... but then, Rembrandt was a bit of an illustrator on the quiet, you know?

But, after all, the aim of art is to create space - space that is not compromised by decoration or illustration, space within which the subjects of painting can live.