What you call a potato has the texture and flavor of something quite different than what I would call a potato. I call it a "strawberry. "
What you see as evidence for the reality of potatoes, I see as being evidence of a circumscribed point of view, a point of view limited by the inabity to see beyond the obvious. You might call it empirical evidence; I call it superstition -- an unwarented trust in the physical senses to tell you all there is to know about the world
Great, so we are making progress here. So, what I call a potato, you call a strawberry. Ok, so you accept that "strawberries exist" ? Right ?
Now, on to potatoes (since we have gotten 'strawberries out of the way =D ). What exactly are you defining as a 'potato' ? Clearly, my definition is different than yours, so, absent an understanding of what you mean when you use the word 'potato', I am not sure that I can help you at all here.
I honestly have no idea at all what your second paragraph is talking about though ??