This piece, which is about onion shaped domes on some churches, was inspired by a chance discovery of a photograph of a church (see illustration) that I took somewhere in Slovenia about twenty years ago.

In the summer of 1975, I accompanied my PhD supervisor, Robert Harkness, and his wife, Margaret, both now no longer living, on their annual drive from Buckinghamshire in the UK to Platamon on the Aegean coast of northern Greece. It took about nine days in their Land Rover, which was towing a caravan that was to become their home in Greece for up to two months. Robert, a well-regarded physiologist, was also a keen naturalist as well as being interested in many other things. This excerpt from an unfinished biography of the Harkness’s that I began writing over a decade ago illustrate one of the varied interests that kept Robert happy.

Soon after we left our camping site on the following morning, we crossed the River Rhine and entered West Germany, where we began driving along its Autobahns. After some hours, we spotted the first of the many onion-domed church towers typical of southern Germany.

Robert speculated that there must be a line of places north and west of which it is almost impossible to find onion domed church towers. This idea made him think that there must also be an olive line north of which no olive trees grew, and a ‘karpousi’ (καρπούζι: Greek for watermelon) line below which watermelons grew. Original as this might seem, Robert’s concept of boundaries based on the presence of this or that particular item was apparently proposed earlier by a French author – it might have been Stendhal – who was writing about those nations whose inhabitants favour eating Brussels sprouts.