The "twin" mirage is seen, commonly in an inverted position, while the real object may or may not be in sight.
An optical effect, as sometimes seen in a mirage on the ocean, but which is more frequently caused by the mirroring of light on the surface that is common to the two levels of air being heated differently.2. Something illusory, unattainable, or insubstantial: Succeeding as an author sometimes felt like a mirage for Steve's friend who received yet another rejection slip from a publisher.
3. Etymology: from French, mirer, "to look at"; from Latin mirari, "to wonder at", from mirus, "wonderful".