What’s more, most dark rooms come with two-way—not one-way—doors. Many of our excursions into the unknown are reversible. As business magnate Richard Branson writes, “You can walk through, see how it feels, and walk back through to the other side if it isn’t working.”31 You just have to leave the door unlocked. This was Branson’s approach with the launch of his airline, Virgin Atlantic. His deal with Boeing allowed him to return the first plane he bought if the new airline didn’t take off. Branson turned what looked like a one-way door into a two-way door—a move that allowed him to walk out if
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