Perceptions Posted on Monday, Nov 30, 2015 12:25AMFriday, December 8, 2017 by Sughra RazaHeather Ackroyd and Dan Harvey. Mother and Child, 2001. ” … By projecting a negative image onto a patch of grass under controlled light, Ackroyd & Harvey use grass's photosynthetic abilities to create living images. …”More here, here, and here.