Convex / Concave, it all depends on your point of view!
Although the plates are the same, in the second picture, the indents of the egg plate look more like convex domes rather than concave indents.
Convex / Concave
Insegno Arcani
My name’s anagram (by Dario Uri): Gianni Sarcone → Insegno Arcani (Italian for “I reveal / teach mysteries”)
Perpetual Motion
Is this a real perpetual motion machine?
Obviously not… The closest thing to a “perpetual motion machine” is the Beverly clock whose mechanism is driven by variations in atmospheric pressure, and by daily temperature variations.
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 Color Radial Beams
“Deep Blue”, the yellowish rays you see in this picture are a construct of your brain. My op art work is available as prints from Saatchi Art gallery.
Color Luminance Sensibility
Do the light gray triangular shapes in the diagram below have the same hue and brightness?
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.
Dalí’s Living Skull
Salvador Dalí : Sept corps nus et un crâne, 1951 (Human skull consisting of seven naked women).
Illusion of Color
Look at the colored rings from a distance. Then decide which ones have YELLOW inner circles, and which ones have BLUE inner circles.
Is Magenta a Real Color?
Most of us are familiar with magenta — it’s a kind of purplish-red that exists between blue and red on color wheels (color wheels don’t accurately represent the physics of photons, but they represent the philosophical reality: color is a human construct that helps us interpret wavelengths to better understand our world).
The odd thing about color vision is that magenta (or pink) color is not in the spectrum of colors, meaning it cannot be generated by a single wavelength of light. Our brains interpret the color sensation of magenta/pink as ‘absence’ of green.
Source: https://www.archimedes-lab.org/Gallery/new_optical_illusions/pages/10n-Pink_rose.html
