"To emphasize only the beautiful seems to me to be like a mathematical system that only concerns itself with positive numbers"

This quote by Paul Klee is a metaphor for the importance of acknowledging the negative elements of life. He is recommending that if we just focus on the positive, we are ignoring the reality of life. It is like a mathematical system that just handles positive numbers, which is not a complete representation of the world. Klee is stressing the importance of recognizing the negative aspects of life, as they are simply as essential as the favorable.

Klee is recommending that by only concentrating on the stunning, we are not seeing the full photo. We need to be aware of the unfavorable elements of life in order to truly appreciate the charm of life. He is encouraging us to recognize the significance of both the positive and negative aspects of life, as they both contribute to our understanding of the world.

Klee's quote is a suggestion that life is not always perfect which we need to not ignore the negative aspects of life. We need to be aware of both the favorable and unfavorable aspects of life in order to acquire a better understanding of the world. By acknowledging the negative, we can appreciate the charm of life even more.