Terror Subterra by Roger Shepard

Estimation 21 September 2015 0 Comments

Terror Subterra by Roger Shepard

It certainly does not appear to be true, but the two monsters shown in this illustration are identical in size.  It looks like the monster in the background is significantly larger than the one in the foreground (maybe even twice the size).  This was originally published in Roger Shepard’s book “Mind Sights” in 1990.  In […]

Spaceships Optical Illusion

Estimation 3 November 2014 0 Comments

Spaceships Optical Illusion

In this new twist on an old optical illusion, two spaceships can be seen flying through a wormhole.  The spaceship in the front appears to be significantly smaller (maybe half as big?) than the one behind it.  Surprisingly, however, both spaceships are the exact same size.  The wings of the spaceship in the back are […]

Spheres Relative Size

Estimation 2 October 2014 0 Comments

Spheres Relative Size

The sphere that is placed closest to you looks to be about half the size as the sphere in the background.  Surprisingly, both spheres are exactly the same size.  If you don’t believe it, grab a ruler and measure them both to confirm. For a similar effect, be sure to revisit the SUV Illusion where […]

How The Ames Room Illusion Works

Estimation,Video 4 September 2014 0 Comments

How The Ames Room Illusion Works

In this brief video from Scientific American, the Ames Room illusion is demonstrated and then completely revealed.  If you are not familiar with an Ames Room, first have a look at this vintage Ames Room illusion photograph.  Now watch the video and see exactly how this trick is done.

Relative Size Animated Optical Illusion

Animation,Estimation 6 March 2014 0 Comments

Relative Size Animated Optical Illusion

Perspective matters.  The angled lines in the animation presented below give the impression that the floor is sloping downward to the left.  As such, the man standing on the left appears to be much shorter than the man standing on the right.  As the man on the left walks up the incline to stand directly […]

The Moon Illusion

Estimation,Video 14 October 2013 0 Comments

The Moon Illusion

Have you ever looked up at the moon in the night sky only to think that it is bigger than normal?  Is it possible that the moon is actually closer to the Earth on these nights?  If you measure the size of the moon on any given night, it is always the same size.  Our […]

Major Drapkin Illusion Card #3 – His Own Size?

Estimation 3 October 2013 0 Comments

Major Drapkin Optical Illusion Cards #3 - His Own Size

There is something special about this post… it marks the 300th post to An Optical Illusion!  A big thank you to our loyal visitors who have submitted material and provided valuable feedback since the inception of this blog.  We always love to hear your thoughts, so please let me know what you would like to […]