CAD is a tricky (well, I found it hard) engineering program which works out angles and scales and junk to tell the laser where to cut to get your design. They had to do test cuts with the laser, because cake is a different material than the laser is used to.
Once it was cut, WITH A LASER, it was frosted and the layers were put together in an extremely geeky way. Delicious!
Take THAT not so humble pie! I’m kidding, I love you.