In the last quarter of the 19^th century — USA-centrically, call it 139 years ago — we began to experience having the sound of strangers’ voices in our lives, even in our homes. Not just voices, but music from concert halls and clubs. And other sounds, too: the clip-clop of horse feet, the slam of a door, a gun-shot. Less than 100 years go, those sounds went electric, and we never looked back.

At the beginning of the 20^th century, we started another love affair — this one with moving images on rectangular screens, a dance of light and shadow, windows to imaginary worlds. Or windows to recorded memories or news of distant places. When sound went electric, those moving images took voice and spoke and sang. No one alive in our society today remembers a time when moving images weren’t woven into our lives.

Here, now, into the 21^st century, in an age of streaming video and music, from cloud to your pocket device (with its high-resolution display and built-in video camera), I can’t help but be impressed by how far we’ve come.

A long way, indeed.