George Porter shows how we can project pictures onto geranium leaves using sunlight. Watch the full third lecture of the series: https://www.rigb.org/christmas-lectures/watch/1976/the-natural-history-of-a-sunbeam/a-leaf-from-nature?utm_source=youtube&utm_medium=social&utm_term=description George Porter gave the 1976 Christmas Lectures "The Natural History Of A Sunbeam" about the power of light, from the role it plays in stimulating life to supplying energy to our homes. The third lecture "A Leaf From Nature", where this clip is from, sees George delving into the link between food and energy in relation to sunlight.