these trig points act as focal  punctuation marks – they dot the landscape: stark, white, concrete and minimal. Superceded now by GPS and aerial mapping but still used a lot by hikers. The metal bracket on the top would have held a theodolite. I love the way their obelisk shape looks so incongruous in the middle of nowhere. Hence the people, standing around, as if waiting for something of some significance to occur, unable/unwilling to avoid the circle.