# Invisible details Rauno Freiberg’s essay Invisible Details of Interaction Design is a close reading of gestures you perform hundreds of times a day without noticing. This chapter walks through it: the metaphors an interface reuses, the physics it borrows, when a swipe should commit, how motion says where things live, why some actions should not animate at all, and what Fitts’s law says about where a target belongs. ## 7 sections 1. [Metaphors and learned gestures](https://learn-ui.com/chapters/invisible-details/metaphors) 2. [Kinetic physics and swipe gestures](https://learn-ui.com/chapters/invisible-details/kinetic-physics) 3. [Responsive gestures](https://learn-ui.com/chapters/invisible-details/responsive-gestures) 4. [Spatial consistency and fluid morphing](https://learn-ui.com/chapters/invisible-details/spatial-consistency) 5. [Frequency and novelty](https://learn-ui.com/chapters/invisible-details/frequency-and-novelty) 6. [Fitts's law](https://learn-ui.com/chapters/invisible-details/fitts-law) 7. [Touch, context, and fidgetability](https://learn-ui.com/chapters/invisible-details/touch-and-context)