Orientation sensitivity refers to visual processing of line orientations, when certain orientations are more quickly and easily processed than others. Think of a standard analogue clock which we can all quickly interpret. Apart from outré previous experience, the positioning of numbers at 30 degree increments around analogue clocks corresponds to minimum recommended for easy detection – differences which are less than 30 degrees can be much more difficult to detect and interpret. Read more »
How smart are our eyes?
In his Theory of Colours, published just over 200 years ago, Goethe describes colour as having ‘a strange duplicity’ and wrote about colour as something other than constant and fixed. Although his theory has been superseded, his ideas on colour perception as a product of the interplay of light and dark are still relevant today. Goethe is also partly responsible for the colour circle that is standard now and the idea of complementary colours. Read more »
From two dimensions to three
Although our eyes collect visual information on a two dimensional surface, our brains do a remarkable job of recreating the world in the ‘surround vision’ of three dimensions. We all have an in-built tendency to see objects and patterns as three-dimensional, especially when certain visual cues are present, and these mental models are the basis of many common visual illusions too. Read more »