By Lucy Kellawa, guest blogger

I draw boxes. I draw them carefully in 3D and then put a little circle at each corner. My husband draws arrows. A line, then a triangular head at one end followed by a similar one at the other. When he is on the phone his hand moves unthinkingly and thickets of double-headed arrows fill up the margins, along the top, in all the available space.

Read the whole FT story here

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