You’ve probably come across a plasma globe in the past: It’s a glass orb filled with various noble gases, and a high-voltage electrode in the center. When turned on, it displays moving purple to pink plasma filaments, and if you touch it, they lock on to the position of your fingers and intensify.
Lytro user tip184 has taken an interesting picture of such a plasma lamp with a Lytro camera, and it’s our Living Pic(k) of the Week:

Be sure to try Perspective Shift (click and drag around) with this one!

Living Picture by tip184