Optics principles. For example, the Ames room, Hering, Müller-Lyer, Orbison, Ponzo, Sander, and Wundt illusions all rely on the suggestion of the appearance of distance by using converging and diverging lines, in the same way that parallel light rays (or indeed any set of parallel lines) appear to converge at a vanishing point at infinity in two-dimensionally rendered images with artistic perspective. This suggestion is also responsible for the famous moon illusion where the moon, despite having essentially the same angular size, appears much larger near the horizon than it does at zenith. This illusion so confounded Ptolemy that he incorrectly
Will He Round the Point? Will He Round the Point? Will He Round the Point? () is an 1885 oil-on-canvas painting by Michael Ancher, a Danish painter associated with the Skagen Painters. The painting is particularly notable as Ancher sold it to Christian IX of Denmark, bringing Skagen and its artistic community to wider attention. The Skagen Painters were a close-knit group of mainly Danish artists who gathered each summer from the late 1870s in the fishing village of Skagen in the far north of Jutland, painting the local fishermen and their own gatherings and celebrations. Michael Ancher, who arrived in Skagen in 1874, immediately