cewes: sometimes the local image reproduction isn't quite right. Try it here on the original website.
eChalk: optical illusions
Re style, the later MASS EXPLAINED essay is now finished, and doesn't mention the TIME EXPLAINED essay. I do expect to have to revisit essays in the light of feedback and revealed insight - hopefully not for any radical corrections, but if that's how it turns out, so be it. I need the feedback to be able to move forward.
