An image of "Corner of the Studio", created by Claude Monet in 1861 (Oil on canvas, 182 x 127 cm).

An image of "Haystack in the Snow, Morning", created by Claude Monet in 1890 (Oil on canvas, 65 x 92 cm).

An image of "Poplars on the Banks of the River Epte", created by Claude Monet in 1891 (Oil on canvas, 100 x 65 cm).

This site explains what perspective is in art and then outlines its historical development, from Brunelleschi's experiment to Alberti's Treatise, in the early Renaissance, followed by early examples of the use of perspective.