According to Edwin how are the lessons about the hotdog,stick and sky similar to life?

All three are used as metaphors to help Cole realize that life is how he perceives it, 

"The sky, this stick, hot dogs, life, it's all the same. It's what you make of it. What you focus on becomes reality. Everybody carries anger inside. But also Happiness. Those who focus on angry will always be angry. Those who focus on happiness will always be happy."

It is all the same when you focus on happiness you are happy, but if you focus on anger you are angry. Its your life, it is what you make out of it, and you can make a decision