" Crop marks are a means through which sub-surface archaeological, natural and recent features may be visible from the air or a vantage point on higher ground or a temporary platform" via migurski

via bennett

via petracortright

“Resonating-With-Light” (Video) by Edo Paulus ... Each unit collects solar energy and transforms this energy into a repetitive bouncing of itself onto a metal tube, thus creating a kinetic and acoustic reaction to sunlight. via vvork