© Van Lier & Vergeer, 2006

Visual Illusion Contest 2006

Rob van Lier & Mark VergeerNICI, Radboud University Nijmegen, The Netherlands

Catching Patches

© Van Lier & Vergeer, 2006

A fuzzy grid...

© Van Lier & Vergeer, 2006

A fuzzy grid. Dark background no patches

© Van Lier & Vergeer, 2006

With luminance edges however...

© Van Lier & Vergeer, 2006

A fuzzy grid. Dark background, light edges dark patches

© Van Lier & Vergeer, 2006

A fuzzy grid. Dark background, dark edges dark patches (weak)

© Van Lier & Vergeer, 2006

A fuzzy grid. Light background no patches

© Van Lier & Vergeer, 2006

A fuzzy grid. Light background, dark edges light patches

© Van Lier & Vergeer, 2006

A fuzzy grid. Light background, light edges light patches (weak)

© Van Lier & Vergeer, 2006

Another grid, but now with thicker fuzzy bars...

© Van Lier & Vergeer, 2006

A fuzzy grid. Dark background no patches

© Van Lier & Vergeer, 2006

A fuzzy grid. Dark background, light edges dark patches

© Van Lier & Vergeer, 2006

A fuzzy grid. Dark background, dark edges dark patches (weak)

© Van Lier & Vergeer, 2006

A fuzzy grid. Light background no patches

© Van Lier & Vergeer, 2006

A fuzzy grid. Light background, dark edges light patches

© Van Lier & Vergeer, 2006

A fuzzy grid. Light background, light edges light patches (weak)

© Van Lier & Vergeer, 2006

Patches follow random changes of the edges at the crossings...

© Van Lier & Vergeer, 2006

Random edges at intersections – 1

© Van Lier & Vergeer, 2006

Random edges at intersections – 2

© Van Lier & Vergeer, 2006

..and using a ‘Geier pattern‘...

© Van Lier & Vergeer, 2006

A Geier-modified Hermann grid – no patches

© Van Lier & Vergeer, 2006

The return of the patches...

© Van Lier & Vergeer, 2006

..catched between the edges!

© Van Lier & Vergeer, 2006

The end

Thanks!