elm-lang/core — pull request #11 by ivendrov (2014-11-23 17:11:59+00:00)
Title: Document the collage co-ordinate system

Had some trouble with this while learning how to use "collage"; seems like the co-ordinate system is not actually explicitly specified anywhere in the library - only implicitly by the examples, as well as in release notes for a previous version of Elm.