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Guy de Saint-Gelais, seigneur de Lanssac (3 December 1544 – August 1622) was a French courtier, soldier, governor and rebel during the French Wars of Religion.The son of Louis de Saint-Gelais and Jeanne de La Roche-Andry, Lanssac inherited a strong position at the French court due to the great favour of his father.
Jeanne-Paule Marie "Jeannine" Deckers (17 October 1933 – 29 March 1985), better known as Sœur Sourire (French for 'Sister Smile') and often called The Singing Nun in English-speaking countries, was a Belgian Catholic singer-songwriter and former member of the Dominican Order as Sister Luc Gabriel.
The Harmonic Convergence was the world's first synchronized global peace meditation, coinciding with an exceptional alignment of Solar System planets on August 16–17, 1987. The event was organized by spouses José Argüelles and Lloydine Burris Argüelles, via the Planet Art Network (PAN), a peace movement they founded in 1983.
Riemann's "dualist" system for relating triads was adapted from earlier 19th-century harmonic theorists. The term "dualism" refers to the emphasis on the inversional relationship between major and minor, with minor triads being considered "upside down" versions of major triads; this "harmonic dualism" (harmonic polarity) is what produces the change-in-direction described above.
In projective geometry, the harmonic conjugate point of a point on the real projective line with respect to two other points is defined by the following construction: Given three collinear points A, B, C , let L be a point not lying on their join and let any line through C meet LA, LB at M, N respectively.
Thomas Young and Hermann von Helmholtz assumed that the eye's retina consists of three different kinds of light receptors for red, green and blue.. The Young–Helmholtz theory (based on the work of Thomas Young and Hermann von Helmholtz in the 19th century), also known as the trichromatic theory, is a theory of trichromatic color vision – the manner in which the visual system gives rise to ...
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Port with the disembarkation of Cleopatra in Tarsus (1642), by Claude Lorrain, Musée du Louvre, Paris. Light in painting fulfills several objectives, both plastic and aesthetic: on the one hand, it is a fundamental factor in the technical representation of the work, since its presence determines the vision of the projected image, as it affects certain values such as color, texture and volume ...