Just accelerate the damn box-sheet to a speed close to c. The yellow box is now just a flat yellow square (well the yellow box could be red-shifted as observed from earth) in the middle of the blue squares. Now just fold the blue cross, and sell off the 4 left-over blue corner squares (Cut the corners andCan you wrap this cube?
Here are the rules:
1. The paper may be only cut or folded along the crease lines.
2. The cutting should not cause pieces to separate.
and donate them to Red Cross). Actually do the sell off before take off to save fuel cost. Or keep the corners to after the task is accomplished to fulfill Paragraph 2. Or yes fold the corners also on top to create a double quadruple sandwich!
Well it all depends a little on interpretation of length contraction, Fitzgerald, Lorentz, Larmor, Albert, Atomism....