43. Reference
https://medium.com/elepath-exports/spatial-interfaces-886bccc5d1e9#.pi6lx9a0v
Spatial Interfaces - Pasquale D’Silva
http://markgeyer.com/pres/the-art-of-ui-animations
The Art of UI animation
https://www.google.com/design/spec/motion/material-motion.html
Google Material Design - Motion
https://medium.com/p/f450432731e5/edit
介面動畫設計要瞭解的事情 - 奧革設計
https://medium.com/@becca_u/the-principles-of-ux-choreography-
69c91c2cbc2a#.dmg8kgt0d
The Principles of UX Choreography
https://medium.com/@jakely/the-why-of-using-animation-in-interaction-design-
350aad16dea0#.3t768tvql
Why using Animation in Interaction