Mirage optical illusion?

Two identical shallow spherical bowls or saucers, about the size and
shape of a headlight reflector, depth about 1/6 of diameter, polished
mirrored on the interior; one has a central hole about 1/4 the OD of the
dish in the middle of the bottom.

Put the one with the hole upside down on top of the other, facing each
other, rims in contact; put a small object in the center of the bottom
bowl. You see two virtual images of the object, one just outside
(above) the plane of the hole in the upper bowl, the other just inside
that plane.

What's the usual _name_ of this setup, or this illusion? (which is sold
commercially -- at a pricey price! -- under trade name "Mirage" by
Optigone, Inc.)
.

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