noun
emptiness is form; form is emptiness
A core Mahayana Buddhist concept from the Heart Sutra, paired with 色即是空. It teaches that emptiness (空) does not negate form (色) but is identical with it; the material world is an expression of emptiness.
See also: 色即是空
"Emptiness is form" is a famous passage from the Heart Sutra.
色即是空、空即是色という考え方は、物事の本質を表している。
The idea that form is emptiness and emptiness is form expresses the essence of things.