Above- 2 1/2 minute video showing how to carve an ice sphere
Below- Step by step instruction

The above sphere took 45 minutes to make using these methods (including photography).

My system is a compilation of the following 3 techniques-
1. The Old Japanese “Carve 3 Hoops” technique.
2. The “Make an 18 sided shape” technique.
3. Junichi’s “Finish with the sphere scratchy board” technique.