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Home > All Images > 2004 > August > 26 Aug 2004

Images Dated 26th August 2004

Choose from 82 pictures in our Images Dated 26th August 2004 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Goblet illusion Featured 26 Aug 2004 Image

Goblet illusion

Goblet illusion. This image is simultaneously a drawing of a goblet and two faces. When there are two competing interpretations of an ambiguous image the brain will often switch between them. So a viewer of this image, which has been around in some form since the 18th century, may see a white goblet for a while, but then change to seeing two black faces in profile. It is impossible to see both at the same time. It is also impossible to view this as abstract shapes - once the brain knows the form of a goblet and of a face in profile it must assign one of the two to its interpretation of this image

© SCIENCE PHOTO LIBRARY

Common crab Featured 26 Aug 2004 Image

Common crab

Common crab. Top view of the Common or Rock crab, (Cancer pagurus) also known as the Edible crab for its tasty meat. Coloured red-brown on top with a yellow-white underside, the claw tips on its powerful pincers are black. The Common crab is a relative of the swimming crabs but lacks flattened paddles on its hind limbs and consequently it is only a moderate swimmer. It prefers to eat mussels but also feeds on worms, other molluscs, algae and carrion. It lives mostly around the shore on stone and gravel bottoms, ranging from the coasts of Norway, Britain, France and Portugal, through to the Mediterranean

© KEVIN CURTIS/SCIENCE PHOTO LIBRARY

Hermann-Hering illusion Featured 26 Aug 2004 Image

Hermann-Hering illusion

Hermann grid illusion. The intersections of the white horizontal and vertical lines in this image appear to be grey. But when looked at directly they are clearly white. This is because of the role played by the edge of the retina. Our peripheral vision is designed to prioritise identifying shapes and edges. To this end the brightness of an image on the edge of the retina is diminished when it is not important to shape identification. At the intersections, a lot more of the area is white light compared to elsewhere on the lines, and there is an effect called lateral inhibition. The brightness is dimmed for this area, and we observe it as grey

© SCIENCE PHOTO LIBRARY