Beyond Human Perception

Challenge #4 in the Technology Enabling Art series. Hosted by ProfHankD.
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Most of the photos people take use the camera to capture what people see; the challenge is to capture things that a person normally would NOT be able to see. The subject might be unseen because it is imaged in NIR (near infrared), happens too quickly (use a fast shutter or flash) or too slowly (use a long exposure or time lapse stacking) for human perception, is seen from a place your camera can go but you can't, etc.
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The Difference A Year Makes
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This image is literally the difference of two very ordinary images taken from the same position by a camera I use as a security monitor controlled by a PC using Linux and gphoto2. The first image was taken in July 2008 with most everything green; the second was captured in February 2009 with snow on the ground and trees bare.
Submitted: Thursday, 7th May, 2009 23:18 (GMT)
Taken: Sunday, 20th July, 2008
Focal length: 7.3 mm
Shutter speed: 3/10 sec
Aperture: F2.8
Notes: The two images were aligned, differenced, slightly enhanced, and cropped using GIMP.
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