Gestalts vs. Math and deductive reasoning

Does Gestalt theory (the whole is greater than the sum of its parts) display one of the limitations of math in general? In other words does gestalt theory show that not all reality can be quantified with mathematical equations? As far as I can see (and I am far from an expert) math is based in deductive reasoning (if all a is b and b is c then a is c). If there are no ‘truths’ (if gestalt theory displays how 1 + 1 does not always equal two) then what does this mean for all the ‘truths’ that mathematics has suggested. Is our reality a construct based on our universal agreement in mathematical ‘truths’ that might not be true? Are we creating the existence of other universes and laws of physics based on inductive reasoning that we constructed to be deductive reasoning?