I can honestly say that I have never seen anything like this before. The England-based artistic collaboration of Heather Ackroyd and Dan Harvey (a.k.a. Ackroyd & Harvey) have been creating large grassy portraits with the use of photosynthesis. They exposed the grass to the sun through large custom-made negatives, creating different tones from yellow to green. It's a breathtaking concept that I would love to see in person.