haboku

Etymology
From, from 破 (pʰà "broken up") + 墨 (mok "ink") (compare 🇨🇬 pòmò 破墨, Cantonese po3-mak6 破墨).

Noun

 * 1) A technique of using splashed ink in brushwork painting, especially for painting a landscape.
 * 2) * 1979, John M. Rosenfield & William Jay Rathbun, Song of the Brush: Japanese paintings from the Sansō Collection, Seattle Art Museum
 * The haboku idiom had appeared in South China in the thirteenth century, and appealed greatly to visiting Japanese Zen Buddhists, who took examples back with them.

Usage notes
Although Japanese has terms to distinguish between the styles of, which properly uses ink of contrasting shades, and , in which the ink is "splashed", these terms in practice are used interchangeably in Japanese and even in English.