Non-photorealistic rendering

''The Impressionist is a paint program that lets you create a painted representation of a photograph. It does this by sampling colors from the source image and then drawing brush strokes onto the canvas.
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I originally developed this painting technique in 1988 on a Silicon Graphics IRIS workstation. Then in 1989 Adobe included a very limited implementation of this idea in the first version of PhotoShop.'' [source]

And:

''Ōkami​ ... is an action-adventure video game developed by Clover Studio and published by Capcom.
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Unique to Ōkami is the Celestial Brush. Players can bring the game to a pause and call up a canvas, where the player can draw onto the screen, either using the left analog stick on the PlayStation 2's DualShock controller or pointing with the Wii Remote.[20] This feature is used in combat, puzzles and as general gameplay.[21] For example, the player can create strong wind by drawing a loop, cut enemies by drawing a line through them or create bridges by painting one, amongst many other abilities.
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Ōkami resulted from the combined ideas of Clover Studio.[29] The art in Ōkami is highly inspired by Japanese watercolor and wood carving art of the Ukiyo-e style, such as the work of Hokusai. Ōkami was originally planned to be rendered in a more photorealistic 3D style.[30] However, Clover Studio determined that the more colorful sumi-e style allowed them to better convey Amaterasu's association with nature and the task of restoring it.'' [source]