Motion-Activated Rock

Say what?

From the website:

Glowstone Motion Sensor Garden Path Light

By day, this looks like an ordinary garden stone — but after dark, it provides (user-adjustable) 5 to 30 seconds of light when motion is detected.

Made of tough, weatherproof resin.

Uses 4 C batteries (not included).

8"Ø x 4"H.

$19.99.