[0] What is imaginable is possible.

[0.1] Also, some things that are not imaginable are also possible because our imaginations are possibly limited.

[0.2] Logical contradictions or contradictions of definition are not possible.

[0.21] A square circle is not possible because the definition of both objects can not exist at once.

[0.210] A thing can not be both a bounded two-dimensional space with equivalent sides and also be the set of all points equidistant from an origin.

[0.3] It is not possible that one thing can equal two things in any possible universe.

[1] It is possible that all the laws of physics could change right now.

[2] It is possible that you are the only conscious entity in reality.

[3] It is possible that human existence is an illusion of some form.

[4] It is not possible that nothing exists and that nothing is thinking because I am writing these very words.

[5] It is possible that your entire life has been a simulation and it is possible that you just came into existence five minutes ago.

[6] But, we have no reason to believe many of these possibilities and, no matter what the possibilities are, there must be something thinking here now.

[7] What is possible in this universe is not necessarily all that is possible because other universes may actually exist or this universe may change.

[8] Being possible simply means that something could happen or be if the conditions are right.

[9] It is important to make a distinction between what is plausible and what is possible.

[10] It is important to note the difference between what is commonly thought of as possible and what is iamginable, ie. logically possible.

[11] Anything that is not a contradiction in terms or in definitions is possible.

[12] What is possible is infinite because no end to the list can be made.

[13] What is possible in a finite system, such as a finite universe is also finite.

[13.1] But, this does not mean that in an infinite system, such as a mind, that there is any limit to what is possible.

[14] It is possible that the number of universes is infinite or finite but this is an empirical observation that may or may not be possibly confirmed or denied by observation in the future.