Next up in the magic filter app list is Prisma. While I'm impressed with its capabilities, I feel overwhelmed with choice; there are too many filters to really be able to gauge what each one will do to a given photo. Exacerbating this is the fact that the filters change position every time you load a new photo. As a usability fanatic with a photographic memory, it's not endearing me to the app. That said, you can sometimes find some nice combinations after a bit of effort. Here's a metro sign on the Pont Neuf, next to the famous and sadly shuttered department store, Samaritaine, as envisioned by Hokusai.