It was a dream 3 years, perhaps more, in the making. It started around 2014, when Phonebloks revealed its aspirations for a modular smartphone. But while that dream has long since died (replaced by a different form of “modular” in Motorola’s Moto Mods), the smartwatch version of that idea has persisted and, against all odds, survived. Now Blocks, the world’s first modular smartwatch, has finally launched for anyone to purchase. Provided you can justify a $259 Android, not Android Wear, smartwatch.