The manufacture of oil paint in tubes made it possible for 19th century european artists to make painting a portable activity. many artists took their canvases, brushes, and tube paints outside to be part of the shifting light they wanted to spontaneously and directly depict.

Impressionists

Explanation:

Impressionism was an art movement that happened during the 19th century. The main subject of the impressionist movement was how the light and the shadows affect the colors of the world. Because of that, impressionist artists made painting a portable activity, they wanted to be outside, in nature so they could capture the shifting lights. This quote of John Constable is an example: “I never saw an ugly thing in my life: for let the form of an object be what it may be - light, shade, and perspective will all make it beautiful.”

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it was the first amendment