What's so wonderful about Constable's cloud studies is that they're very modest pieces, but they have this extraordinary power to capture time.

One of the wonderful things about pen and ink sketches like Turner's is that you can actually see how the artist is thinking.

Hecht's print has been made with a form of engraving that's very direct – you scratch the plate directly with a sharpened instrument called a burin, so you get a very living, very real line.

In this drawing by Brangwyn, it's almost as if you're a voyeur in this very intimate and very precious activity of reading.

I think there's inherent strength in Kauffman's arms and how she presents herself in this self-portrait. She has a look of tremendous determination.

I think Casson's sketch for a book cover gives you an idea of how architects look at space and think about space.

In this Japan-inspired drawing, you can see Parsons' thought processes as he's exploring another culture's artistic practices.