People have made many artefacts to navigate landscapes; these objects take my attention. They offer the possibility of passing through the world more safely, avoiding hazards and being guided securely. You have to know their code. They are surreal, anomalous interventions; hard edged Euclidean geometry, bright non natural colours, intentionally contrasted with the dull colours and fragmented soft geometry of natural landscape, visually challenging nature’s processes of growth and decay. The markers are simplified ‘equivalents’, symbols suggesting what they mark: a red cone signifies a rock pinnacle. The marks bring together human and nature; sky and ground; past and present; God and materiality. They place a figure in the landscape; and remind us that not all that matters can be seen; the buried electricity cable; the channel taking us safely to harbour; the reef.