Well I had no idea how dirty my image sensor was until I took a 3 bracketed exposure and ran it through photomatix. There were giant blobs all in those dramatic skies, but it does interesting things with just a single RAW shot. As I understand it, you shoot with aperture priority so as to get the same depth of field in each exposure? No bike pics until I clean my sensor.
Something hidden. Go and find it. Go and look behind the Ranges - Something lost behind the Ranges. Lost and waiting for you. Go!