In an old disused quarry Strijdom found a large vertical rock positioned by nature within a larger rock. Discontinued quarry work had left four vertical carvings in the rockface, ready for Strijdom to pour water down the top of the flat front surface, painting four vertical lines, at first lengthening, then widening and eventually merging. Clouds moving in front of the sun during the shot darkened it, rendering it unusable. Had to be repeated and reshot another day.