I am a supporter of the idea that man perceives the "real world" through a depiction he has made. And this depiction is made combining his senses with his logic. So, in the lowest level of analysis, he treats the world as parts that "are being" or they "are not being", e.g. either there is a particle or either not. There seems to be an "on-off" property assigned in the basic structure of the world. We say the electron has two states 1)it exists 2)it does not exist. No third or forth or even more states are assigned. Is this only the only way to make a depiction of the real world? Is this the most integrated logic? Does it make sense talking of more states or it is self-contradictory? These are some thoughts that I am lately having and have confused me. PS In the case of matter, I don't think we should perceive the term "anti-matter" as the 3rd state of matter, but as a different component of the world, so we can say that anti-matter either exists or not.