the fractional perturbation in the spacetime geometry produced during each doubling of the expansion parameter during inflation.
Response to my 'Get Pushed' challenge from Christopher.Cannon www.flickr.com/photos/christopher_cannon/, a very talented wildlife photographer with some amazing shots from the Great Smokey Mountains National Park and other places.
1.) Take a photo that has the main subject out of focus. The entire photo can be out of focus, or it can just be the main subject. The subject matter can be anything you choose, but try not to use any photo processing to blur the image.
I think I did it backwards, with the main subject in focus, but there you go.