Lilac Chaser

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(i) What is the image about?: It is an optical illusion. It is sometimes known as the pac-man illusion, there are 12 discs in a cirlce. At the center of the circle there is a small black cross, the background is grey, and the 12 discs are lilac and blurred. The discs disappear briefly, one at a time in a clockwise direction.
(ii) What do you find interesting about the image?: I find it intressting that when one stares at the cross for about 5 seconds one notices a green disc running around the circle of lilac discs. The green, a complementary color to the lilac, appears when each lialc spot disappears.
(iii) what graphic format does the image use?: GIF (Graphic Interchnage Format)

Facevase

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(i) What is the image about?: It is an ambiguous bi-stable image. It is an image of either a vase or two opposed faces in profile, both ambiguous figures are black on a white background. The edges of each opposed face form the outline of a symmetrical vase. The edges of the innermost indent of the vase form the tip of a nose outline, the indent above that form the outline and the double indent below form the mouth outline.
(ii) What do you find interesting about the image?: I find interesting that perception of the two images changes, even if there is no specific point to draw the eye (such as, for example, a cross at which the viewer stares intently for a set time ). I also find it interesting that the viewer, once made aware of the fact that there are two images, is able to easily switches back and forth between the two images
(iii) what graphic format does the image use?: JPG (Joint Photographic Experts Group)

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(i) What is the image about?: It is an ambiguous image in which a rabbit or a duck can be seen.The duck's beak serves as the rabbit ears. Conversely, the rabbit's ears can be seen as the beak of duck.
(ii) What do you find interesting about the image?: I find it interesting how a two dimensional figure can be perceived in several different ways. I find it interesting to ponder what makes the viewer see one animal or the other. Am I predisposed to see a rabbit if it is Easter? Am I predisposed to see the duck after I’ve ready the story of the ugly duckling?
(iii) what graphic format does the image use?: PNG (Portable Network Graphic)