Green Isle, ScotlandI came across this cross on the Isle of Iona, off Scotland's west coast. Iona has been a centre of Celtic Christianity since the sixth century, when St Columba founded his monastery here, and these high crosses are among the finest early medieval carvings in Europe. The overcast light was perfect for it. No shadows cutting across the panels, so every detail in the knotwork and figural scenes reads clearly. The lichen on the base has been building up