An ant travels on a parallelepipedic box.
Say with size 1m × 2m × 4m.
What is the shortest path from A to B.
Say from point A at h = 10cm of midpoint of the shortest edge
and B at opposite side.
And now h = 20cm ?
An what if h = 30cm ?
And even more, for the pros :
A room 1m wide × 1.20m height × 1.24 length