Browsing archives for 'Estimation'

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 […]

Twisting Spiral

Estimation,Motion 13 January 2014 0 Comments

Twisting Spiral by Gianni Sarcone

Take a look at the spiral created by Gianni A. Sarcone below.  Does it appear to be moving in a clockwise direction? Now start on the outside and follow the lines that make up the spiral around in a clockwise direction.  Do they spiral to the middle?  Or is this really made from a series […]

Pinna’s Illusory Intertwining Effect

Estimation 9 December 2013 0 Comments

Pinna's illusory intertwining effect

This figure looks like a warped spiral made up of white and black squares on a gray background.  If you examine it more closely, however, you will find that it is actually made up of four concentric circles.  This illusion was first described by Baingio Pinna and Richard L Gregory in a 2002 article titled […]

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 […]

Broken Line Illusion by Brad Honeycutt

Estimation 12 September 2013 0 Comments

Poggendorff Illusion by Brad Honeycutt

Do the two ends of the green line passing behind the gate appear offset or aligned?

Toy Train Track Optical Illusion

Estimation,Video 5 August 2013 1 Comment

Toy Train Track Optical Illusion

Today’s video spotlights the Jastrow Illusion using a pair of identical toy train tracks.  The two wooden train track pieces appear to be longer (or shorter) than the other when arranged one on top of the other.  When one of the pieces is placed directly on top of the other, however, it is obvious that they […]