This week, a pre-show discussion about Tom Petty and crafting the perfect pop song leads into our sense memories around specific film stocks. It sounds strange, but there’s a throughline there if you give it a chance. Also, is Instagram just one big performance art piece? Plus, a listener question prompts a discussion around objective vs subjective challenges and moving the needle. Jojakim Cortis and Adrian Sonderegger are our Photographers of the Week.