It’s the three dimensions into two, conundrum…inadequately solved by projections. Crossing from Auckland to Melbourne a few years ago we calculated we would have saved 24 miles by following a great circle route rather than a fixed course. That’s four hours over an eight day journey.

When Mr Lewin began explaining how cartographers addressed the challenge of portraying what is essentially a three dimensional object - the world - on a two dimensional plane - a piece of paper - my eyes lit up!