Besides all the modern armaments of a military base, the Presidio of San Francisco contains a bit of natural protection from a spiky hedge of agave.

This photo was taken by a Mamiya C-330 TLR medium format film camera and Mamiya-Sekor 1:2.8 f=80mm lens with a Mamiya 46ø Y2 SY48•2 filter using Kodak TMAX 100 film, the negative scanned by an Epson Perfection V600 and digitally rendered in Photoshop.