Tim continues teaching about the 3D modelling software he uses. Today our source was a bathythemetic map of the world and while showing me various functions he pointed out that the programme had calculated that in approximate terms the mean height / depth - depending on how you view it - of the Earth’s surface is 1424 metres below sea level!

A statistic which for a moment held us both rapt and bringing home afresh the extent to which the sea, rather than earth, dominates the surface of the planet.

The most common height above sea level is 85 metres and the least 3,3800 metres below.