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Images Dated 27th August 2004

Available as Framed Photos, Photos, Wall Art and Gift Items

Choose from 362 pictures in our Images Dated 27th August 2004 collection for your Wall Art or Photo Gift. Popular choices include Framed Photos, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


Ouchi illusion Featured 27 Aug 2004 Print

Ouchi illusion

Ouchi illusion. The central circular area of perpendicularly orientated bars appears to move and float compared to the surrounding pattern. The effect is particularly marked when the observer moves relative to the image. It is thought that the circular contour leads to ambiguity as to where the vertical bars terminate, and hence to ambiguity as to its own position. The brain therefore fails to integrate the whole image into a cohesive whole and so our eye movements cause apparent motion

© SCIENCE PHOTO LIBRARY

Impossible trident Featured 27 Aug 2004 Print

Impossible trident

Impossible trident. This uses the fact that a rectangular bar can be represented in 2 dimensions by 3 lines, whereas a cylinder requires 2. So we have 3 cylinders blending into 2 rectangular bars. The brain tries to identify the shapes but is left confused due to the ambiguities over to which part the edges belong. This object has been used to demonstrate that the visual system compares different regions through counting, since the first thing most people notice is that 2 prongs at the beginning change to 3 at the end

© SCIENCE PHOTO LIBRARY

pH measurement of oxide solutions Featured 27 Aug 2004 Print

pH measurement of oxide solutions

pHs of oxide solutions. Aqueous solutions of the oxides of some elements with universal indicator (UI) added to show their pH (acidity). The element forming each oxide is labelled. The oxide of sulphur produces sulphuric acid, which has the lowest pH (strongest acidity). UI changes colour according to the pH, from red (most acidic) through yellow (mildly acidic) to blue (slightly alkaline) to purple (strongly alkaline). Sulphur oxide forms sulphuric acid in water, which is highly acidic. Sodium oxide forms sodium hydroxide (a strong alakai). Oxide pH increases from left to right across the periodic table

© ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY