Delboeuf Illusion

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

The red circles have the same radius. However, their sizes seem to vary, depending on the sizes of the blue circles. This illusion was first discovered by Franz Joseph Delbouf, a Belgian philosopher and expert on hypnosis.

Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA


Snapshots


Details

detailSectionParagraph


Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.
Send