The Post-it Note's canary yellow was never designed — it was inherited from scrap paper in a 3M lab drawer. Spencer Silver's "failed" low-tack adhesive waited six years until Arthur Fry turned it into a removable bookmark, and the pale yellow stuck. Since 1980, that exact shade has become shorthand for provisional thought: handwritten, peelable, human.
This system channels the sticky-note vernacular — tilted paper squares, graphite handwriting, marker-pen accents, and the warm optimism of a color that says "remember this." Every surface feels like something you could peel off and rearrange.
便利贴的淡黄色从来不是刻意设计的结果——它来自3M实验室抽屉里的废纸。斯宾塞·西尔弗1968年发明的"失败"弱粘胶等了六年，直到亚瑟·弗莱把它变成可撕书签，那张淡黄色纸片就此改变了办公文化。1980年商业化后，这个精确的淡黄色成为"临时想法"的视觉代名词：手写的、可撕的、从不永久的。
这套设计系统捕捉便利贴的视觉语言——微微倾斜的纸片方块、铅笔灰的手写字迹、马克笔蓝色的重点标注，以及一种温暖的乐观感。每个界面元素都像是可以撕下来重新排列的便签。