With three trips remaining on this project, I’m anxious to hit the road. The weather, however, is playing up – one minute the sun’s out, the next the clouds conspire to steal the light. My destination today – Tinto Hill – involves a day trip, but one I’m almost tempted to invent rather than venture 50 miles south east of the city. Does my physical presence matter, I ask myself, or could I simply make a virtual journey, pieced...

Spinoza

On my crowded desk sits a diagram of Harry Bell’s network, described by him as a pattern of possible prehistoric communication lines, or PCLs. It seems even at the end of his quest he was still hedging his bets. At first glance the pattern is incoherent, its lines forming a vague exploded star containing a set of triangles within triangles. At its centre,...