I'm nearsighted....have been since I was in grade school, so sometimes when not wearing glasses, I see things, but not clearly. Maybe that is a good thing, but at other times my imagination fills in where I can't see clearly.
Such was the case recently when we stayed in a hotel. It seemed to be an older building which had been remodeled. The walkways outside the room had a definite tilt to them, but room interiors were nice, with new furnishing and fresh paint. The bathroom counters were granite with matching granite forming the walls of the shower.
My eyes said black spots. My mind screamed "SPIDERS!" That got my heart rate up a bit!
Fortunately a closer look confirmed there were just 5 mysterious black spots in the otherwise uniform granite. Whew!