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> You know, I've opened up a Hawkeye. The motion and light detectors are > VERY small, less than 1/8" in diameter. Couldn't you do something like > pinhole the circuit board onto the back of a picture?

Yeah, but it really wouldn't do what you want it to do.

If you check out most PIR sensors, you'll discover the circuit is set up to trigger when there are sudden "jumps" in sensed heat levels. However, you'll also discover that the PIR sensor is sensitive in a cone extending out from the sensing area.

You turn "movement" into "jumps" with the facetted lense, which causes people moving across the field of vision of the device to snap into and out of focus as they leave the focus of one factt and into the focus of the next. Remove that lense, and movement will remain in constant focus... no jumps, no detection. (This, BTW, is why PIR sensors are almost always "motion" sensors, not "presence" sensors.)