A photo from Mother Nature

Mar 2 02:12 UTC 1996

Want to see a unique photo effect?  Look at the wooden sound barrier walls
along I-94 just West of Metro Airport.  The wood was protected by the tree
leaves in the summer.  The non-shaded area darkened and the shaded area stayed
light forming a photo of the summer foliage.  

response 2 of 2:

Mar 12 02:20 UTC 1996

Pretty sure, but it's hard to tell from 70 mph whizzing past!
The "image" is the size of a full crop of leaves and evenly spaced around the
center of the "stalk" of the tree.