Another example of the blurring of reality is ESP. Believers in ESP claim to have the ability to obtain information without using the physical senses.
Again, this only adds to the uncertainty of reality.
Besides these false impressions our senses disregard much of “reality”. Dogs can hear ultrasound. This is how 'silent' dog whistles work.
Dogs have a nose approximately a hundred thousand to a million times more sensitive than a human's. Some bats use ultrasound for echo location while in flight.
Dolphins have their own sonar based sense.
Bees are sensitive to the polarization of light.
Back to optical illusions:
There is no actual movement in the above design.
This illusion was developed by Professor Akiyoshi Kitaoka at the Department of Psychology in Japan's Ritsumeikan University.
Below is the Pinna-Brelstaff Illusion of rotating rings.
Stare at the center. Move your head towards, then away from the image.
The direction of spin and the speed of the circles will change as you change the direction and speed of your head.
I sometimes have a scary thought. Considering the physical limits of our perception of reality and the contradictory philosophical disagreements on the actual nature of reality; the possibility of the existence of events and even beings in the brink between what is assumed to be real and what is assumed to be fictitious is not easy to dismiss.
“As to the ultimate nature of things we can know nothing,
and only when we admit this do we return to equilibrium.”
“All that we see or seem is but a dream within a dream.”
-Edgar Allen Poe
“Every man’s world picture is and always remains a construct of his mind,
and cannot be proved to have any other existence.”
“Our dreams are our real life.”
To keep my sanity I must have faith that what I experience is real enough to get by.