Woodsie I didn't at any stage say the physical world and things dont exist. I said how we interpret things about us is our personal interpretation of what is happening. Things happen and we observe them happening, but its our personal interpretation.
Take an example of colour. Colour doesn't really exist as it appears to us. It is our evolutionary development of three nodes behind our eyes that interpret specific wavelengths of photonic energy as red, green and blue. But they are just wave lengths of photonic energy interpreted in a certain way so that for survival we can observe and make sense of what's around us. It exists primarily for survival reasons as does sound, taste, smell, etc all evolutionary developments to use certain natural characteristics for survival. But they aren't what we see, smell, taste, feel. That is the bodies mechanisms that interpret those signals in a specific way.
That's a simple issue but the question of interpretation follows across the board. I'm not saying reality doesn't exist, I'm saying how we interpret it, is in a very partial manner in understanding interpreting what exists. A dog, as I mentioned would have a quite different interpretation because its olfactory sense is more dominant than its sight, and it does not see quite the same way we do. Its interpretation of reality would be quite different. Neither are wrong, but its not about reality, its about how we interpret it and that's different