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The side of the fin facing the wall.

I'm not certain as to what the brackets mounted to the surface are. I don't remember for certain, but I believe that the fin is a complete fin (i.e., it's not just one surface panel "for show" and just interior structure on the other side). Perhaps these were added at some point to mount the fin to a wall at some point in the fin's past, in a different exhibit?

Picture 2 of 2.

This photo is taken facing the floor, looking from top to bottom. There's a fluorescent light fixture on the wall at top.