Gather a square sheet of paper
Fold the paper in half both ways
Unfold it
Fold each corner toward the center
Fold the top and bottom edges toward the center
Unfold the top and bottom folds
Fold the left and right edges toward the center
Unfold the left and right folds
Fold the top and bottom edges back to the center
Fold the left and right edges back to the center
Lift the side flaps to form the box walls
Press the corners inward to shape the box
Flatten and adjust the edges so the box holds its shape