Van Gogh, yesterday
Turns out that Van Gogh [...reverential pause here...] spent time at my old school, Isleworth Grammar in West London. That could explain the pointilistic patterns oft seen in the jacks. He taught grammar [would you believe] and French. Not at the same time as I was there, obviously. Curiously, I don't remember any mention of the Great Impasto, so perhaps he became an embarrassment after laying it on a bit thick once too often.
So I have the right schooling, then.