Apparitions

This ghostly face appears to mysteriously change its features when you look at it for a while (some viewers said they have experienced traumatic visions!). Moreover, if you unfocus your eyes and just look steadily through the image, you will notice that after approximately 10-15 seconds the face gradually disappears…

Ghost Faces / Apparition – Mixed media (2011)

This spooky portrait is made by merging together 50 common human faces. The process of averaging multiple exposures of human faces isn’t really new. Already in 1879, Sir Frances Galton was experimenting with this photographic process. Others followed, and borrowed this technique for artistic or social purposes: Ken Kitano, Jason Salavon, Donald Scott Bray

Continue Reading

Amazing Brightness Constancy Effect

Look carefully at the saw-tooth wave patterns on this picture. Is the background of the picture uniformly gray or are there different shades of gray?

Kolozanges (2013-2021), © Gianni A. Sarcone

Brightness constancy makes some vertical strips look darker, when in fact the gray background is all the same shade of gray.

This op art work is available as prints and canvases from my official online Gallery.

Paradoxical Elastic Squares

A math-magic article I wrote for the German magazine Zeit Wissen: with the 13 triangular and square pieces (fig. 1) it is possible to form two large squares shown in fig. 2. Though the second large square has an extra piece the dimensions of the squares seem to be the same! Can you explain why this is possible?

This puzzle is available as greeting cards from my online store.

Ghost Colors

This is one of my earliest color optical illusions. There is no yellow or green in the diamond shapes, just vertical black lines! (If you don’t believe it, use a eyedropper tool to check it.) This intriguing visual effect is mainly due to “simultaneous color contrast induction“.

Illusive colors
Ghost Squares / Black Diamonds (2002 – 2007)
Continue Reading

Scintillating Starburst: Seeing rays that aren’t there…

This is one of my oldest illusions I created in the 90s. In the picture you may see ghostlike dark radial beams. This illusion is a variant of the Herman’s scintillating grid illusion. I designed this illusion just by turning 45 degrees the Herman grid and then by applying a polar transformation.

From my book “Eye Tricks“, 2001-2007.
Continue Reading