…by using the natural geometry of your joints. It took me a while to figure out that it’s easy to draw lines in some directions and hard in others. And most of the time it’s simply down to respecting the pivots of the elbow and the wrist. And also why we tend to angle our notebooks so much to the desk, and why, if you want to draw a smooth line at another angle, you’re really best-off just turning the paper.

As a corollary, I figured out that by looking at angle of most of Leonardo Da Vinci’s cross-hatching you can see that he was drawing left-handed.

Draw smooth lines

I’ve never used one, but I’d love to. They seem a little like magic. Basically, you pressurise the air of an underwater box enough to keep the water from coming in. This enables you to have a kind of swimming pool entrance to water even though you’re already actually underwater. So cool.

Moon pool

If you were to dig straight down from where you’re standing and pass straight through the centre of the Earth and keep on digging — you’d now be tunnelling up I guess — where you come out would be your antipode. Though most of them would first have you springing a leak at the bottom of the ocean, so be careful.

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Antipodes