Notan Light-Dark

Notan — Japanese for "light-dark" — is the design discipline of balancing masses of black and white with no midtone between them. Brushed in sumi ink on white washi, a notan study is fundamentally reversible: a yin-yang interchange where positive and negative carry equal weight. The honest ground is the black field with white shapes cut from it, not a defaulted white page.

This system distills that two-value rigor into an interface language. Components read as flat white masses cut from a carbon-black ground, their edges carrying dry-brush character. No gradients, no grays, no color — only the patient negotiation of light against dark.

「浓淡」（Notan）在日语中意为「明暗」，是一门以纯黑与纯白两种块面达成平衡的设计训练——黑白之间不留任何中间灰调。以墨在白色和纸上挥毫，浓淡习作本质上是可逆的：正形与负形如阴阳般互换，彼此承载同等分量。其诚实的底色，是从黑色场域中剪出白色形状，而非偷懒地铺一张白纸。

本设计系统将这种二值的严谨提炼为界面语言。组件如同从碳黑底面上剪出的扁平白色块面，边缘带着干笔飞白的笔触。没有渐变，没有灰度，没有色彩——只有光与暗之间耐心的相互制衡。