Isn't #56 described as a bamboo pot with rainwater? I can't recognize a septic tank. I see a propane tank in the photos, but it comes a lot later. I just think people have different tastes, quirks and differing takes on humor. A week later I might vote for different photos, so I guess frame of mind at the moment of voting affects things, too. I know my own approach is completely muddled! Sometimes I thought it was a good photograph and voted which is I think how it's supposed to work in a 'photo' contest. But often I think I am influenced by a well grown plant and the camera just showed up at the right time. In those cases I'm probably voting on the subject instead of the photograph. Other times something just appeals because of the combination of what's in the photo. Less about the quality of the photo than about the elements seen in the photo. I enjoy the photos presented a lot; not so much the voting. Too hard.
