Country diary: You think you’ve seen it all, then you buy a UV torch | Mark Cocker

Lightwood, Derbyshire: Shine it on a simple green plant like moss or saxifrage and they become glittering, baroque jewels

I'm blaming my fellow diarist KateBlincoe. Recently, she extolled the joys of a UV torch, on the strength of which I bought one, have become addicted and now see the world entirely anew.

Ultraviolet is a shortwave, high-energy light normally undetectable to the human eye, but it is also damaging to many life forms. In the late Proterozoic ,most life flourished only under the sea, until the protective UV shield - the ozone layer - formed, 15km to 30km aboveour heads.