Greg Mankiw points to the following quotation from John Hicks:

"Of all great economists, Mr. Keynes is probably the most Impressionist; the General Theory, in particular, needs to be read at a distance, not worrying too much about detail, but looking principally at the general effect."

The Monetary Theory of D.H. Robertson", 1942, Economica

My take: In case you like art and worry about detail, you might garner some inspiration from this painting:

Quentin Massys (1465–1530), The Tax Collectors

If I had to think of an impressionist painting that reminds me most of Keynes and the aftermath of fiscal illusion, I'd probably go with L'Absinthe by Edgar Degas.