A state of quietness Tea is said to be the way. This is because it is something one learns to appreciate through feeling, not through verbal instructions. If a person maintains a state of quietness, only then will one appreciate the quietness inherent in tea. Lu Yu, The Book of Tea silenceunderstanding
Up and Down the Ladder of Abstraction An Essay by Bret Victor worrydream.com The most powerful way to gain insight into a system is by moving between levels of abstraction. Many designers do this instinctively. But it's easy to get stuck on the ground, experiencing concrete systems with no higher-level view. It's also easy to get stuck in the clouds, working entirely with abstract equations or aggregate statistics. This interactive essay presents the ladder of abstraction, a technique for thinking explicitly about these levels, so a designer can move among them consciously and confidently. From a roving viewpoint abstractionunderstandinginteraction