Balance is the way shapes are arranged to create a design which is pleasing to look at.
Balance does not always mean that the work of art has to be even
or not lopsided.
There is:
It is a matter of feeling. Don't put too much logic into it!
Go on with Design and Pattern Study
Note to Teacher: The work shown as an example of asymmetrical balance was that in the January offering of Sam Gilliam, 1933-, Open Cylinder, 1979 from the NMAA. However, the link to the image is not available.