A photography exhibit opening Dec. 9 at Charter Oak Cultural Center in Hartford, “All That Remains,” reflects on the impermanent nature of memory. Photographer Richard Hollant said the theme fits his own transitory recollections of the photos he took, as well as the medium he used to capture the images. “They stopped making Polaroid film years ago. You can buy it from people who bought it back then, but it’s past its expiration date. There is no guarantee it will still work,” Hollant said. “The more enamored I get with Polaroid, the more I find its ephemeral nature. It has a feeling of ‘that too will pass’.” What also “will…