Productivity pattern for knowledge workers proposed in the wroclove.rb 2018 'offline sandwich' lightning talk. The day is split into ~4 rounds, each a sandwich of three phases: offline focus (60–90 min, Slack/phone off, plan set up front, ship something concrete by the end for instant gratification), online (~30 min, catch up with colleagues), and off-topic (Twitter, coffee). Alternate framing: 'immerse yourself underwater' or 'put yourself in a little jail' for the focus phase. Works best with remote + asynchronous + autonomous work.