For decades it was a thing of science fiction. Books and movies have long depicted their protagonists speaking commands to inanimate objects and having orders carried out instantly. I think it's safe to say that most everyone, including myself, used to daydream of being able to control lights simply by giving a voice command from anywhere in the room, no longer having to get up and walk over to flip a light switch on or off.
Then Philips introduced their Hue lightbulbs and companion API, moving traditional light switches a step closer to obsoleteness by introducing the ability to turn lights on and off with a smartphone app, bringing us one step closer to making voice controlled lights a reality. When the second generation Hue bridge was introduced with HomeKit support, Siri gained the ability to control Hue peripherals, creating the ultimate ease-of-use scenario.
There's almost a magical property surrounding Philips Hue lights. A room can be lit or darkened by a spoken word, its walls repainted in an instant, or the atmosphere changed to anything from a tropical sunset to an Arctic aurora. There's really no limit to what one can do with a few Hue lights and some creative inspiration.