Hello. I read a lot about Casimir Effect. It creates attractive (or repulsive)force between two metal, parallel, electrically neutral, conducting plates. It causes that between plates, it is less electromagnetic field fluctuation wavelength than outside (vacuum). Logic tells me that if vacuum energy is zero-point energy that energy between casimir plates must be NEGATIVE! I also read that casimir effect is measurable if the gap between plates is less than 7-5 nanometers. Is it possible to operate casimir effect on macroscopic scale, say a few centimeters, meter?