Somewhere in this room a phone is holding open a window to twelve thousand people at once, and the physics of that still stops me cold. The face on the screen is not really there. It is a grid of light: a few million red, green, and blue subpixels, each one a tiny gate deciding, sixty times a second, how much current to let through.
What you call a smile is a pattern of voltages refreshing faster than your retina can resolve.
But follow the signal outward. Those voltages become radio: an electromagnetic wave, the same stuff as visible light, leaving the phone's antenna and reaching the tower in the time it takes sound to cross a dinner table. From there, glass. The comments scrolling up the side, the little hearts, the streamer's laugh, all of it is encoded as pulses of infrared laser fired down a fiber thinner than a hair, bouncing along by total internal reflection at very nearly the ultimate speed limit of the universe.
Two hundred thousand kilometers a second through the ocean floor.
Here is the number I keep turning over. Light takes about 130 milliseconds to circle the whole Earth. So when someone on the far side of the planet types "hi" and it appears under this glowing face, the delay is not really the distance. The distance is almost free. The lag is the switches, the servers, the decoding. The planet itself is the fast part.
Twelve thousand strangers, watching one person be lonely at 2 a.m., and the loneliness is arriving at each of them riding a beam of light that has, in effect, treated the entire size of the world as a rounding error.