Tim, James and Eric, thank you so much! I appreciate you taking the time to comment the image. All very valid points, thank you again. This picture is a part of series I hope to accomplish some day. I'm taking pictures in this very same location at different times of the year. What caught my eye in the beginning was indeed the "box" of light under the bridge. And then the series started to take form...
Here's the beginning, as seen on June 5th, 2012:
(http://jjuntunen.kuvat.fi/kuvat/Kuvia+metsist%E4/Valoneli%F6/Valoneli%F6_1x1/Valoneli%F6_kes%E4kuu-1299.jpg/_img900.jpg)