The author of this article is from the same department at Notre Dame as my religious philosphy prof. I recognized the name, but I also immediately recognized the style, and the horrible headache I had the day we covered the idea of things existing as long as you can conceive of them existing.
I'm pretty sure I brought it up here back when I was taking the class, but it's been a while. Give it a read, then the question - does something exist if you can conceive it and explain the concept to someone else? We know there is no such thing as a unicorn, and yet, a cartoon image of a unicorn exists, and is recognizable immediately to anyone who sees it, without requiring a caption or an explanation to say "this is a thing called a unicorn". The same is true of Daleks, Hobbits and perpetual motion machines.
It is also true of certain celestial objects that we know exist only because of the absence of something else - we cannot see a particular planet trillions of miles away, but we can see the absence of light when it passes in front of another object. We cannot see it, touch it, taste it, smell it, or hear it, but we can understand the concept of its existence. Same with assorted sub atomic particles or even the very thoughts in our heads. We cannot isolate those thoughts, but we can be sure they exist - or can we?Answer Question
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