Now you see it now you Don't.

Only a rare few could see it, and when they did, a second look proved it to be a mirage.  Now you see it now you don't.  But by definition a mirage is an optical illusion caused by atmospheric conditions, especially the appearance of a sheet of water in a desert or on a hot road caused by the refraction of light from the sky by heated air.  My eyes saw one thing, and that day it looked real and out of place.  That day I was out and about with my new camera taking landscape shots, and skyline shots.  By the naked eye, I saw in the near distant what appeared to be a large and by large I mean at least 8 floors high a radar disc down in the valley towering over the trees and houses.  In a spot where there shouldn't be a radar disc, as it was in my neighborhood I had been living in for some 15 years.  I raised my digital camera and by the display focused on the object.  It appeared on my display.  I focused my lens to a wide shot to get it in and snapped my shot.  When I lowered my camera and looked down the hill.  It was gone.  When I scrolled through my shots I discovered the pictured I had snapped was there, but there was no very large radar disc towering over the treetops in the shot.  Just houses, trees and a blue sky with a few white clouds and in the distance the nearest 15 floor apartment tower.  By the naked eye for just a moment was the large radar disc.  Now no disc, just the tallest building near my downtown residential neighborhood.  Minutes later, after walking down the hill into the valley to where I believed was a radar disc was just a large empty parking lot.  I shook my head in disbelief that it was real, that I had seen a mirage.  I dismissed it has a mirage, to which my digital camera did not record once I snapped the shot.  But why did it see it with the naked eye before I snapped the shot and not on the actual picture?  I went home and forgot all about the illusion chalking it up to tired eyes that day.