It's an iPhone app. There's not much to do in the app, there aren't a lot of buttons to press. Once it's installed and you set the permissions, every time you put on your headphones — your AirPods or any other headphones, it doesn't matter—it chimes and says, "Beebop's been activated." (Beebop is the first project from the company, Hopscotch Labs.)

Then as you walk around the city, it will tell you things about certain places. Eventually, if I walk by a place where my friend was, it tells me that Alex was here two days ago. If I walk by a place and someone's inside, it tells me that Max is inside that place. A lot of it is still under development. Eventually, people leave a comment at a place. Imagine Twitter. It is as if you leave a tweet and you stick it in the ground. When you walk over it, you hear it.

So like before, it's about experiencing cities:

It's been a long time since I built something. What's different now? AI is what's different. You know what's different? Everyone's on their phones all the time. Back in my day, we made stuff for the streets. You would use your phone, you'd put it away, and stuff would happen. Where are the people making that stuff anymore? All we make is stuff that makes you look at the screen. Let's make stuff that gets you out in the world, where you're not glued to the devices. You're out there doing stuff. Big companies out there aren't going to make stuff like this.

The key idea here is that augmented reality doesn't have to just be visual. Visual also requires somebody to figure out a cool set of glasses that people will actually wear out in public. Who knows when this happens, though I do think it will eventually.

So what Dennis is doing is making something that works today -- with audio. This has been called the poor person's augmented reality, but I think that's selling it short. This is really clever. And once again, it's fundamentally connected to how people live in and interact with our cities.

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