When you go flat, you are no longer tied to the physical world, and ideas and interfaces can take on a more abstract form.
当你变平时,你就不再受物理世界的束缚,想法和界面可以采用更抽象的形式。
西南联大英文教本
All Goods are disguised by the vulgarity of their concomitants, in this work-a-day world; but woe to him who can only recognize them when he thinks them in their pure and abstract form!