The note is based on the observation that the geometric optical behaviour of an object S described by the Schwarzschild interior solution is formally exactly that of the Maxwell fish-eye, truncated at some finite radius. Since the explicit point characteristic of the fish-eye and the character and disposition of rays within it may be obtained without having to solve any ray equations, the imagery of S is fully known. Of particular interest are the conditions under which a point source I in S has a real image I' in S, granted that one considers such an image to exist if at least some rays from I mutually intersect in I'.