While I'm at it, I found some more great links for the 2008 signal mirror "performance art" above. It seems he made "foresight" style signal mirror aimers of a novel type.

I think the "black X" on the front of the mirrors is part of his aiming system - that you align the shadow "X" with the "V" edge of the foresight.

I would have used a smaller mirror aiming hole and the British "foresight" aiming method of an "aiming spoon" with a hole the same size as the mirror hole - you align the center of the mirror hole and the center of the spoon hole with the target, and then centralize the "shadow spot" cast by the mirror hole on the spoon hole. (Diagram) (Photo)

Worldwide, non-US life rafts tend to carry the British "foresight" type of signal mirror.

Here are the links for the 2008 performance art:

• High Resolution Video on Vimeo
• High Res Photo with hidden links (Hover over the bottom inside edge of the bottom left corner of the photo to see the hidden hyperlinks)
• Magazine article (p.2) showing signal mirror aimers