Vertical Elements from Horizontal Elements.
In every landscape project there always has to be a vertical element...I don't know why, but there just has to be...people don't just walk around staring at the ground...So let me introduce you to Heather Ackroyd and Dan Harvey, artists that used grass as a photographic medium. They grew the grass in a dark room while projecting images onto the grass, creating an effect similar to photographic paper and chemicals used with good old film.

Link Via Inhabitat