From the submitter:

"My office just installed a new safety light in the stairwell."

Hey, it's cool! You can sorta see up at the top. "Sorta" is good enough when OSHA is concerned, right?

This weekend, from the bathroom of a friend of mine, in São Paulo. The light is to illuminate the shower. Just be sure it doesn't... y'know... fall into the shower and break the bulb and... y'know... electrocute you? Y'know?

More than ten, apparently.

Homemade brake lights - a bulb inside a bottle covered with red plastic, suspended from a wire.