The discussion revolves around a photo contest themed "Gone, but not forgotten," where participants are encouraged to submit images of objects, people, or structures that no longer exist. Contest rules specify that only original digital photos are accepted, with a maximum size of 650 x 490 pixels, and modifications are not allowed except for cropping or adding a watermark. Participants express challenges in finding suitable images, with some discussing personal memories tied to their submissions, such as iconic local landmarks facing demolition or nostalgic childhood scenes. There is a debate about the interpretation of the theme, particularly regarding what qualifies as "gone," with some members pushing the boundaries by suggesting images of transient natural phenomena. The conversation highlights the emotional connections to the subjects of the photos, as well as the creative process of digging through archives for relevant images. Participants also share their thoughts on the difficulty of the theme and the potential for future contests.