Anti-Matter Annihilation, showing an anti-proton disintegrating into elementary pions, is representative of man's visual limit into the microcosm.  The diameter of the anti-proton is about 10^-15 meters, which is about 450 million times smaller than an ordinary wave length of violet light (450 millimicrons).  In actuality then, this photograph shows only the traces of the anti-proton as it moves through a bubble chamber, the bubbles being what we are really seeing.
                       (Courtesy Lawrence Radiation Laboratory)