I am working on a new two-dimensional variant of the Müller-Lyer illusion… You may be surprised to know that the Müller-Lyer illusion isn’t only linear: it involves plane geometry too! In fig. A shown below, the ends of the blue and red collinear segments, arranged in a radial fashion around a central point, delimit two perfectly concentric circles. However, for most observers, they seem instead to define a large ovoid that circumscribes another one, slightly eccentric (Fig. B). This comes from the fact that the red segments seem to stretch towards the lower part of the figure, while the blue segments seem to stretch towards the upper part of the same. As you can see, in this variant comes also into play the “neon color spreading” effect. In fact, a bluish inner oval-like shape appears within the black arrow heads (Fig. A), though the background is uniformly white.
Science
Man Can Never Be Clean
The human body plays host to trillions of microorganisms. So many, in fact, that they outnumber our cells 10 to 1! Fortunately many of these microbes are vital to human health.
Using a cell-culture dish filled with a nutrient broth commonly used in labs, Tasha Sturm, a microbiology tech at Cabrillo College in California, gently stamped her 8-year-old’s hand on the plate. She then incubated the petri dish at body temperature and 2 days later, the bacteria and yeast that were transferred to the dish had built a blooming colony (see featured photo above). Continue Reading
Turn A Still Photo Into A Short Movie
From the static image shown below (representing an automated conveyor system), it is possible to create a looping seamless animation…
Early Projector
This Roman artifact is considered a possible precursor to the magic lantern. According to the Italian engineer and author Flavio Russo, placing the flame of a candle or small lantern behind the elliptical lens could project the image or portrait painted on its surface onto a white wall, operating on the same basic principle as modern slide projectors. A comparable concept was later explored in the 17th century by Athanasius Kircher, who demonstrated the projection of images using light and lenses—an early step toward the development of the magic lantern.
Bamboozle your mind with illusions
Bamboozle your mind with Super Optical Illusions – my book of brain boggling artworks is a clever gift for curious-minded children. Find hearts that beat in the middle of the page and snail shells that spiral off into infinity. Enjoy a preview of my eye popping illustrations below and look for many more in Super Optical Illusions – available now!
As an author, designer, and researcher in the field of visual perception and creative thinking, I like to combine art, psychology, cognitive sciences, and recreational logic to test people’s ingenuity.
I have created or adapted most of the illusions contained in my books. Many were created and perfected during my workshops which are held for the benefit of children and adults alike (more information at: http://www.archimedes-lab.org/prospatelier.html).
Try to solve the optical illusion puzzles below without looking at the answers.
The Football
Stunning Vibrant Metallic Gold Color Insects
Nature is truly the mightiest artist itself! This amazing insect is the “Painted Weevil” (Eurhinus magnificus), a splendid species that sports a metallic emerald, gold, copper and ruby exoskeleton that makes it look like a tiny jewel when spotted in the grass.
Super Optical Illusions
The outside world is mediated through our sense organs, so what we perceive and feel are just representations of reality. The only things we cannot doubt are our inner emotions: we cannot doubt that we are happy, sad, in love, or in grief, when such states apply. The only other thing we cannot doubt is… to doubt!
Super Optical Illusions (aka Xtreme Illusions 2) is a children book project I enjoyed to make three years ago for the publishers “Carlton Books” [amazon.co.uk], “National Geographic Kids” [amazon.com] and “Ça m’intéresse” [amazon.fr]. It looks really fantastic and my pictures are large to enjoy the details! It is a family book that will encourage the young reader to explore the mysteries that lie right inside our own minds (including the key scientific concepts of perspective and perception).
Book Cover
Continue Reading
Reuleaux-triangle intermittent mechanisms
The Reuleaux triangle is a curious geometric shape: it looks like a rounded triangle, yet it has a remarkable property. Each side is an arc drawn from the opposite vertex, and together these arcs form a curve of constant width. In other words, no matter how you measure it—between two parallel lines—the width always remains the same.
Because of this property, a curve of constant width can act as a rotor inside a square. As it turns, the shape remains in contact with all four sides of the square at every moment, tracing a continuous motion while never leaving the boundary.
Mechanisms based on intermittent motion appeared early in mechanical engineering. One of their first practical uses was in sewing machines, where motion had to advance in precise steps rather than continuously. Today similar mechanisms are widely used in devices that move film frame by frame—such as cameras, projectors, and film-processing equipment—where controlled, stop-and-go motion is essential.
Turning Klein’s quartic curve inside out
Klein quartic has 24 symmetries forming a group isomorphic to the rotation/reflection symmetry group of a tetrahedron. Algebraically speaking, this group is S4: the permutations of 4 things.
What color does it look to you?
1 in 12 people have some sort of color blindness that makes them unable to distinguish certain colors or shades of colors from others. Color blindness is, however, an inaccurate term to describe a lack of perceptual sensitivity to certain colors; a more precise term is: Color Vision Deficiency (CVD). Color blindness is the most commonly used term though it is misleading if taken literally, because colorblind people CAN see colors, albeit they cannot make out the difference between some couples of complementary colors. Color vision deficiency is not related to visual acuity at all and is most commonly due to an inherited condition. Red/Green color vision deficiency is by far the most common form, about 99%, and causes problems in distinguishing reds and greens. There is no treatment for color vision deficiency, nor is it usually the cause of any significant disability.
The most commonly used test to detect color vision deficiencies is the Ishihara Color Test.
Color vision deficient people have a tendency to better night vision and, in some situations, they can perceive variations in luminosity that color-sighted people could not. In fact, most color blind people can easily read what is written in the dotted pattern below… If you fail the test, that means you probably have the full range of color sensitivity that is attributed to color-sighted people.
[Highlight the blank space to see the answer: NO]
