how can things exist?

Question:  How can things exist and not exist!?  Isn’t this confusion in itself?  It either is or it isn’t.  How can they coexist?
 
Response:  What is existence?  In your 3rd sentence, what does “it” refer to?  This needs to be answered first.  If you simply observe the object—by “simply” I mean “without talking to yourself or thinking”—whatever it might be, you can (and you may) eventually see directly that “it” is an imagined “thing.”  What is less difficult to see is that what we innately mean by “existence” is persistence—i.e., that “it,” the presumed object, persists for a time, however brief or long.  But this is what we never find.  An object that persists.  We only assume it.  Go ahead.  Name something.  Look at it.  Feel it.  Think it.  “It” doesn’t persist.  Not even for a nanosecond.  We don’t actually find existence, in other words.  Consequently, neither do we find nonexistence.