Asymmetrical basketball I am creating a basketball based on this tutorial. Now , just before UV unwrapping this is my basketball:



At this point in the tutorial (about 12:30 min) this text is presented:


  A viewer pointed out that the valleys on a real basketball are not
  symmetrical on the sides like my model. If you care about that, then
  before proceeding here select the right half of the basketball in side
  view, press Y to split it, then rotate it 90 degrees in front view and
  remove doubles. Do this for the rubber too and fix any seams. Look at
  a real basketball to see how the valleys are not symmetrical.


Questions After looking at some images of basketballs I still don't understand the remarks about the symmetry. But I really don't understand the instructions about how to make this model a real basketball, especially the parts about splitting the mesh and removing the doubles. Anyone ??

here is my file



I have tried the solution of Carlo and this is the Front Ortho view 



This is the Back Ortho view



and this is the right side
He is stating that he was inaccurate by mirroring the octave of the sphere in all three axis as on the Y is not symmetrical. This kind of ball, as in tennis and baseball is traditionally made by joining two complementary pieces



This is what you have at the moment:



Notice that the model is symmetrical on all the three axis while in the real traditional basketball (usually) isn't.

What you should see from one side is different from what you have on the other. Here's a pic of the different flows of the leather patches in the front and rear view:



As you can see each patch embrace the other, so one of them must be rotated by 90° from the other to join correctly. 



The difference is only in which patch stop at their intersection. One time should be one and vice-versa.



About the tutorial:

What you probably missed is that the Mirror modifier should be applied before following the textual instructions, or you'll not able to edit the geometry.



At the end of the gif it looks as if nothing wasn't changed at all but is just an illusion caused by overlapping geometry: I showed how to perform the instruction only on one of them.