Google sold most of Motorola Mobility to Lenovo for $2.9 billion earlier this year, but it kept one small part of the phone manufacturer. Motorolas Advanced Technology and Projects group had been working on Project Ara when it was incorporated by Google — an ambitious plan for a modular smartphone that could retail for around $50, comprised of parts that users could purchase and swap in and out at their leisure. Now Phonebloks — a company who previously worked with Motorola to create a concept for a modular smartphone — has shown off how Project Ara is progressing in a video tour of Googles offices. Those magnets are electro-permanent, meaning phone components can be secured or unlocked with an app: a design decision that means Project Ara phones wont need a covering or outer case.