Under one roof, Microsoft has united a team of designers, engineers, and prototypers, and invested heavily in infrastructure and equipment, so that Building 87 can be a self-contained hub, complete with manufacturing capabilities that usually would be located offsite or outsourced. Having these capabilities close at hand drastically cuts down on dead time, so that, in some cases, mere hours after a designer sends a concept down the hall to the prototypers, they can figure out a way to embody that concept, and print it in 3D or manufacture it on the spot. The model-making team can then hand that iteration off to the mechanical engineers, who assess the viability of the concept and figure out ways to improve it. It’s sort of like one endless feedback loop, with designers conceiving, prototypers creating, engineers correcting, and back again to the designers. This collaboration and synergy are a crucial part of the Surface’s success.