An Interactive Guide to CSS Transitions A Reference Work by Josh W. Comeau www.joshwcomeau.com In this tutorial, we'll dig in and learn a bit more about CSS transitions, and how we can use them to create lush, polished animations. cssanimation
The axis of movement Moving in the city means constantly changing the axis of movement. In general, lateral movement is confined to a single plane, what’s called grade, the ground level. Because circulation in multistory buildings is fundamentally one way—which is to say from the bottom up—the condition at the top is invariably different from that at the bottom. Rooftop circulation is the domain of Fantômas, of cat burglars and fleeing criminals, of lovers, and of those acrobatic enough to negotiate the gaps between buildings. Michael Sorkin, 20 Minutes in Manhattan A Burglar's Guide to the City movement