According to Wave-Particle Duality, in a normal double-slit experiment, the quantum object behaves as wave and many stripes are displayed on the screen. But if we measure which way the quantum object passes (the measurer being the "observer"), the object becomes a particle upon being observed and just 2 stripes are displayed.
Since double-slit experiment succeeded with electron objects, other objects such as neutrons and buckyballs were also succeeded with. Theoretically, any object must be applicable, even cats.
But if we really did the experiment with cats, wouldn't the theory be inconsistent? By our perspective, there is no such thing as "observers" (just like with electrons, or just like in Schrödinger's Cat) and many stripes must be displayed. But what about in the perspective of the cat itself? Isn't the cat itself an observer (ex. it might feel collision into the plate), and must just 2 stripes be displayed? The perspectives being inconsistent?
At first, what exactly is an observer? As the plate itself consists of atoms, why doesn't the plate itself entangle with the object?
EDIT: If just as electrons, the cats are isolated systems, does this mean the cats CANNOT observe themselves? Resolving the inconsistency?