– Mike Pickard and Gurpreet Singh: “The Dalesmen Singers Illusion”. Sunderland University, UK
Are the letters in the illusion actually moving? The answer is no, they are rock steady on screen! Only the letters brightness’s are changed where the fill pulses alternatively between the black and white values of the edges. This creates a tiny impression of movement which is then amplified in the viewers mind by optimisation of the brightness and colour values in the scene, together with different phasing of the letter fill luminance changes. These create uncertainty in the viewer’s mind and the ability to pin down the precise spatial arrangement of the letters and so the sense of movement is increased.