An ant is sitting on the corner of a plastic ice cube at a picnic, and wants to go to the opposite corner (body diagonal) because it sees some tasty sugar cubes. Can you determine the shortest travel path for the ant?
The fastest path for the ant goes across the surface of the cube.
This becomes apparent if the cube is viewed as a flat object”. The image illustrates the straight line that cuts the edge between the green and the grey areas across the surface of the cube.