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An iPad style screen that lets people browse SN sounds dope. But, like you said, it depends on the environment -- internet stability and lighting come to mind as factors that will influence the quality of the experience.

Maybe QR codes that link to particularly artistic posts on SN? There are a bunch of photography ones. And here are some links to artistic posts that I especially liked, including one of my own:

#913452

#905076

#1274883

#1464712

#1274130