I have been looking for somewhere to drink my whisky with a nice spherical ice cube. It has nothing to do with the aesthetic and everything to do with physics. A spherical ice "cube" has a much improved surface to volume ratio - this reduces the thermal transfer to the ice and makes it last longer. In essence it allows you to sip your whisky at your leisure without getting it all wet and tasteless.
If you are very lucky you can get your whisky or fine bourbon with a spherical ice cube at 50 plates.