Solaris, the acquisition of knowledge or skills does not necessarily increase your intelligence. Perhaps if you define intelligence, as you do, by “differentiation” but not only is this incredibly vague, its also not an accepted definition of intelligence.
There is no generally accepted definition of intelligence among the scientific community that I am aware of. If there is one, I would certainly like to hear it.
Possessing an ability to differentiate means that you can accurate describe differences between two or more objects/creatures/people in your environment. Taking the example of piano playing again, if I just started playing I would not be able to read music. By practising, I would slowly increase my ability to read different notes and couple them to specific keys on the piano. By increasing my ability to read music, I am better able to differentiate in the area of piano music.
I guess what I’m trying to say is: intelligence is having the potential to gain new skills and abilities.
Precisely. Intelligence is your potential, or ability to learn new knowledge and skills. It cannot be defined by the number of skills the number of skills and abilities you already possess.
However, you do not seem to realize that there is a difference between possessing an ability to differentiate in a specific area in life, such as piano playing, and possessing an ability to differentiate in life in general. It is quite possible for an individual to be highly intelligent in one area of life, and a complete fool in another. Taking your example of two people playing piano, it is impossible to state that one player is more intelligent then the other. One can only accurately state that the person who has been playing for a year is more intelligent in the area of piano playing. It is probable that he is more intelligent in life in general, but he might not.
What I stated was that you can build you ability to differentiate in life in general by learning to differentiate in as many specific areas of life as possisble. I will take your example of baking of an apple pie as an example. Reading three books on this subject will definately increase your ability actually bake an apply pie. However, by doing so you will probably pick some things up about cooking. Thus, by increasing your ability to differentiate in a specific area of life, you will also increase your ability to differeniate in a broader field.
If you learn to differentiate in enough specific areas of life, you will slowly increase your ability to differentiate in life in general. Thus, you will increase your intelligence.