By the mid-17th century, telescopes had improved enough to make visible the seasonally growing and shrinking polar ice caps on Mars, and features such as Syrtis Major, a dark patch thought to be a shallow sea.

Professionalism in art has this difficulty: To be professional is to be dependable, to be dependable is to be predictable, and predictability is esthetically boring - an anti-virtue in a field where we hope to be astonished and startled and at some deep level refreshed.

I don't write about too many male businessmen, and I'm not apt to write about too many female businessmen.

For male and female alike, the bodies of the other sex are messages signaling what we must do, they are glowing signifiers of our own necessities.

There is no intrinsic worth in money but what is alterable with the times, and whether a guinea goes for twenty pounds or for a shilling, it is the labor of the poor and not the high and low value that is set on gold or silver, which all the comforts of life must arise from.

I didn't do it for the money. I know a lot of people say that, but if I'd wanted to be rich, I'd have stayed working as a city lawyer. I gave that up eight years ago and took a massive drop in salary, and I didn't mind because I was doing what I loved. There's plenty of material for the other five books.

Disciples of Keynes, who focus on aggregate demand, view any increase in household wealth as raising employment because they say it adds to consumer demand.

History and social sciences were my interests. I was always interested in knowing how societies get organized, why there is rich and poor divide, why there are classes. I was never apolitical. I think we are all political in a way. Politics decides our day-to-day life.