Family trees

Jean and I went to Templeton Woods this morning and came across a group of trees with letters on them. I wondered if it was an artwork and if it was one of those things where you had to align yourself in a particular way in order to read it. It was!

"mum" and "daughter" it read.

There was also "son" to the side but I'm not sure if "dad" was there too as we didn't go round to check.