What philosophy does Marie Kondo follow for re-organisation of homes?

Kondo's practice is rooted in Shinto tradition. She was once a priestess in a Shinto shrine. The relationship to objects is crucial to Kondo’s method and hinges on her Shinto background.

She respects each item for what it has served even though it may be discarded and allows for the sentimental attachment we have to certain objects. Though KonMari is self-help method, it’s self-help rooted in a Shinto spirituality.