And on to the block for the fort itself, called naturally enough Fort Sumter. It's a rather abstract version of the fort in the harbor (the real one being five-sided) being fired upon. See:
I did the lines of fire in red because it seemed the traditional and appropriate thing to do; now I don't know, though. Compared to the rest of the blocks I've done that's a bit too much red. Also I'm not sure about the other colors, though the blue water is okay enough. If I redo it I think I'll make the red artillery fire lines narrower, like seven-eighths of an inch, an inch wide.
And yeah, one of these days I'm going to figure out how to take a picture that isn't blurry!