Replace push of a button with push of a bulb and you get the idea behind the Lighbulb Pushlights.

And it’s not just that it saves on space, and wires, and having to find a convenient place for a button, which might ruin and otherwise naked and glistening wall, but there’s something about the idea of touching a bulb and it coming to life that’s very appealing.

Light under the lightest touch, something along those lines.