Google’s Project Ara is a really interesting concept; a smartphone that never really becomes obsolete. Working on that concept, a new contender has emerged in the form of Circular Devices, a Finnish company readying their own modular smartphone, the PuzzlePhone. Visually, it’s a bit more approachable than Google’s Ara, and a bit simpler overall. Rather than make each component swappable, PuzzlePhone has two major elements you can replace: the brain, and the heart. It’s a neat concept, and may end up the next step in modular smartphones.