Start with a square sheet of paper
Fold the paper in half horizontally, then unfold
Fold the paper in half vertically, then unfold
Fold each corner into the center crease intersection
Fold the top and bottom edges into the center line, then unfold
Fold the left and right edges into the center line, then unfold
Open two opposite sides to form the box walls
Push the remaining sides inward to shape the box
Press the corners and edges firmly to secure the box shape