Heidegger used the term readiness-to-hand, and the example of a hammer. When you are hammering successfully, the hammer withdraws from your conscious awareness; it becomes transparent. Winograd uses the term fluency. When you speak your own language or are truly fluent in another, you don’t think about nouns, verbs, and tenses, you just speak. He aspires to that kind of transparency in HCI, and it’s not one size fits all. The keyboard interaction is still best for email, and the touch interaction of smartphones may be better for other things, such as finding a hookup on Tinder.