The ultimate test for the existence of a black hole is to see its event horizon, or rather, the shadow of its event horizon. The best candidate for such an experiment is the black hole lurking at the center of the Milky Way. I will elucidate the physics which might make it possible to see the shadow, and the feasibility of doing so with VLBI. I will also discuss how polarization measurements might help in determining at what wavelength the event horizon becomes visible through the synchrotron absorbing cloud.