One of the ideas in Drive that has spread the fastest and the widest is the FedEx Day. Invented by the folks at the Australian software company Atlassian, these one-day bursts of autonomy allow people to work on anything they want (as long as it’s not part of their regular job) — provided they show what they’ve created to their colleagues 24 hours later. Atlassian dubbed these innovation jamborees FedEx Days because participants have to deliver something overnight.