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• Start from
• Rotate 180 degrees with a valley fold the two West adjacent tiles (the two extremal tiles in the flat 2x2 square)
• Lower the upright flap 90 degrees against the other flap
• Rotate 90 degrees the two adjacent tiles pointing down, one of them will stack against the two stacked flaps
• End up with a 2x2 square with two stacks of two tiles in the West positions, a stack of three tiles in the North-East position and a single tile in the South_East position
• Open in 3D with the following hingings
  • Keep the two tiles in the NW stack together
  • Hinge the SW stack about the West side
  • Hinge the two top tiles in the NE stack about the North side
  • Hinge the two bottom tiles in the NE stack about the West side
• The resulting structure is contained in a 1x1x2 box and comprise a pair of stacked tiles
• Rotate 90 degrees a group of three mutually orthogonal tiles
• Rotate 90 degrees a newly created flap into the final shape