Skip to main content
Framed Pictures, Canvas Prints
Posters & Jigsaws since 2004
Home > All Images > 2004 > August > 27 Aug 2004

Images Dated 27th August 2004

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

Choose from 90 pictures in our Images Dated 27th August 2004 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, 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


Mercury thermometer Featured 27 Aug 2004 Print

Mercury thermometer

Mercury thermometer showing a room temperature of 24 degrees Celsius. The mercury thermometer works as mercury, a liquid metal, expands evenly as the temperature increases. As it expands it fills more and more of a narrow tube, which is marked with a scale in degrees


24 Degrees Celsius, Device, Equipment, Measurement, Measuring, Mercury, Physics, Room Temperature, Single, Thermometer

Simultaneous contrast Featured 27 Aug 2004 Print

Simultaneous contrast

Simultaneous contrast example. The green squares look brighter on the left, where they are in yellow bands, compared to the right, where they are in blue bands. There is no actual difference between them. This is a demonstration of the effect known as simultaneous contrast - the phenomenon whereby the perception of different colours is altered by their surroundings. There has been some debate - most notably amongst the 19th century scientists Helmholtz and Hering - as to whether this results from neurological effects or from retinal pre-processing. It is likely that it is a combination of the two