A Box Fit for a Cube!

You said 'wow', so I had to show you something even bigger! I tumbled across the floor, rolling corner over corner like a wild green dice. Then—BAM! A brown cardboard shoebox resting right against the shelf. It called to my blocky soul! Without stopping to check the depth, I launched myself straight over the rim in one gigantic belly flop! THUD-SQUEAK! Perfectly wedged. All four sides pressed against my plush edges like a custom fort. I am the ruler of this square haven!