Henri Matisse (31 December 1869 – 3 November 1954) was a French artist, known for his use of
color and his fluid and original draughtsmanship. He was a draughtsman, printmaker, and sculptor, but is known primarily as a painter. Matisse is regarded, along with Picasso and Marcel Duchamp, as one of the three seminal artists of the 20th century, responsible for significant developments in painting and sculpture.
View of Notre-Dame is an oil painting by Henri Matisse from 1914. Along with works such as Woman on a High Stool, it belongs to the "experimental period" of Matisse's oeuvre. Pentimenti reveal that it was originally painted in a more detailed manner before it was radically simplified into a geometric composition.
Wikipedia, Henri Matisse.
A kaleidoscope is a tube of mirrors containing loose coloured beads, pebbles, or other small coloured objects. The viewer looks in one end and light enters the other end, reflecting off the mirrors. For a 2D symmetry group, a kaleidoscopic point is a point of intersection of two or more lines of reflection symmetry. In the case of a discrete group the angle between consecutive lines is 180°/n for an integer n≥2. At this point there are n lines of reflection symmetry, and the point is a center of n-fold rotational symmetry. Source:
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