The only things in this world that we can be sure of are our own experiences. Many feel that our lives, our perception of the world are simply bundles of our own experiences. There is no more to the physical world or physical objects than our experiences and counterfactual experiences to them. As an example, if you try to explain to me that you have any reason to believe that the physical world exists that doesn’t appeal to an experience of yours or a counterfactual experience of yours and you will fail. Let’s take for instance the fridge that sits in your kitchen. If you were to leave the kitchen and go to bed, and then wake up in the morning and enter the kitchen again, would the fridge still be there? Yes, most of us would have reason to believe that it would still be there. It is from these experiences in which we can form the “belief” that the fridge in your kitchen does exist. But how do we know for sure that the fridge does in fact exist outside of our experience?