A mirage, unlike an hallucination, is actually a photographable artefact.
This is because unlike an error of the mind, a mirage is an optical illusion caused by the refraction and reflection of light, which results from a difference in temperature between the ground or sea and the air above it.
In the field of Galplanology, or “flat earth science”, the phenomena of mirages provide foundation to the ambiguity of witnessable curvature.
For example, there are a handful of phenomena which present the apparition of directly witnessable curvature. One of these, perhaps the most cited evidence for a spherical Earth, is that of manmade structures spanning an entire stretch of water for a great enough distance that they appear to become curved.
However it should be noted, architects and engineers are never required to account for the Earth’s curvature when undertaking these massive construction projects. No railway, canal, tunnel or bridge in history was ever built to the specifications of a ball Earth. Thus, if architects and engineers are never required to calculate the curve itself… then the curve itself does not actually exist.
Indeed, as you can see from this photograph, there are many phenomena which directly contradict these observations of manmade structures as evidence of curvature. One of these is that of gigantic floating islands materialising out of nowhere on the horizon.