Yes, 2+3 does not equal 5, not in the world of metaphor anyway. The numbers 2 and 3 represent definite events that come together and although we think we know the outcome of those events happening, the outcome is always more and less than 5. For example, I may think if I go to a good school and work hard, I would land up with a good education. This is true, of course, but a lot more happens in addition to my receiving a good education. I learn, I make friends, I get inhibited