It shows paintings based on your location and the 'time of day', or something.
From the `About`:
>Plein Air — A painting for right now, wherever you are
>Plein air — French for in the open air — was the discipline of painting outdoors, in front of the weather, the way Constable studied clouds in Suffolk meadows and Monet painted the same haystacks at every hour of every season. The painters took the canvas outside because the light couldn't be remembered later, only stood inside as you painted.
>Plein Air stands you next to one of those paintings. The sky over your head and the sky in the painting share the same kind of hour — the same long afternoon, the same threatening storm, the same fog clinging to the river. One painting, chosen for right now. Tap the title to see why it was picked.
From the `About`:
>Plein Air — A painting for right now, wherever you are
>Plein air — French for in the open air — was the discipline of painting outdoors, in front of the weather, the way Constable studied clouds in Suffolk meadows and Monet painted the same haystacks at every hour of every season. The painters took the canvas outside because the light couldn't be remembered later, only stood inside as you painted.
>Plein Air stands you next to one of those paintings. The sky over your head and the sky in the painting share the same kind of hour — the same long afternoon, the same threatening storm, the same fog clinging to the river. One painting, chosen for right now. Tap the title to see why it was picked.
Weather.
The current sky at your approximate location, as a CSS gradient https://news.ycombinator.com/item?id=44846281
Can't zoom/scale without the page falling apart.