The Z axis

The picture below was taken by my friend Rakesh Vohra a few days ago, during Australia's autumn. The picture has been reproduced here with his permission. It is a remarkable picture composition. The sky has this Z axis written all over it. There is even an arrow pointer to the right of the Zed (Zee, if you are an American) axis name, showing the positive side of the Z axis. The earth below is the x,y plane, with many coordinate points in the form of bonsai trees. The remarkable thing is the unsaid things: the heart, and the head therein.

The earth is the first and second,

Sky is the third dimension,

The sky is the z axis,

Earth's is the x and y

The earth holds the heart in place,

And the sky holds the head high.