Google's UI framework Material Design has been evolving over the years. It seems, we're about to see the culmination, the final iteration, the pinnacle of evolution: Material Design Omega – a bunch of flat circles.
A gradual increase of corner radius was the staple of material design release notes, version after version. It shouldn't come as a surprise that the final version had achieved the maximum roundness possible.
"In the Greek tradition, the heavens were a place of perfect circular motion" comments chief UX designer Jeffrey Benedict XVII. He refused to provide further clarifications, however.