Step Day was the day in 2015 when Willis Linsay uploaded the circuit diagram for the Stepper Box onto the Internet.[1][2]

The Stepper Box caused the Long Earth to become a phenomenon known by all humans, and made stepping possible for everyone (rather than just natural steppers, like in the past).[3]

The Long Earth

On Step Day, when the diagram was first released, kids from all around the world started putting together Steppers and disappeared.[2]


  1. The Long Earth - Chapter 2
  2. 2.0 2.1 The Long Earth - Chapter 3
  3. The Long Earth - Chapter 33

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