Any Art-Deco-era designer would've been thrilled to create these, but the form would have been impossible. Now that low-profile LEDs exist, however, Tokyo/New-York-based designer Nao Tamura can and did design these.
You've probably noticed there's no visual switch. As for how they're operated:
"Using Ambientec's unique technology, it is a waterproof-cordless lamp embedded with a touch sensor, that one can adjust its light output in 4 increments to compliment a variety of occasions. Two types of LED segments were uniquely developed in order to generate a quality of light ranging from and replicating a candle like glow, to a bright luminous light that can bring out the colors in a meal or the brightness befitting reading."
My only criticism: For the sake of not leaving fingerprints and fiddling with a touch sensor, I'd have preferred a physical switch. (Then again, I've got a thing for switches.)