Three days ago I found out someone else built my app. Same name. Same concept. I’d been chipping away at it quietly for six, seven months — the kind of slow, private building you don’t tell people about because it still feels too fragile to survive being said out loud. And then there it was. Already live. Already someone else’s. I was devastated. Not dramatic-devastated. Just hollowed out, the way you get when something you were protecting turns out to have already left the building. The next day, a video showed up on my feed. David Bayer, talking about visualization — and not the way I’d always understood it. Not…