Masu box from a pentagon.

-Take a square.
-Fold and cut a pentagon.
-Fold one side of a pentagon out of the way by tucking it underneath to obtain a four-sided pyramid.
-Twist the pyramid to form a new square that lies flat except for an small residual pyramid in the centre.
-Fold a masu box lid or a one piece Gift Box from the resulting square.

Other models must be possible. How about using 6 of them to make an inside out studded sonobe cube?

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Challenge Irregularities