Twisted Cord Illusion


The only browser that currently runs Java applets is Firefox where, too, you have to make the site cut-the-knot.org trusted in the Java setup

Twisted cord illusion


What if applet does not run?

A few words.

|Contact| |Front page| |Contents| |Geometry|

Copyright © 1996-2018 Alexander Bogomolny

The parallel lines do not often look parallel.

The first figure depicts the so called Twisted Cord illusion, the second the Brick Wall one (needs rotating through 90°.) The latter has a page of its own.


References

  1. A. Seckel, The Art of Optical Illusions, Carlton Books, 2000 (#30)

|Contact| |Front page| |Contents| |Geometry|

Copyright © 1996-2018 Alexander Bogomolny

72023566