Today I worked on adding signals between the various models for the world map. This ensures the models only know about their child and not their parent.

Editor -> World -> TileList -> [Tile]

In Elm signals are kinda equivalent to events, but described as "a value that changes over time". I don't quite fully grok them at the moment, so I suggest reading the info here if you're interested - http://elm-lang.org/learn/What-is-FRP.elm

No exciting screenshot for this though today.