A prototyping tool is provided to an artistic team, which can use the tool to experiment with, demonstrate, and communicate aspects of the user interface interaction with various user interface elements. These user interface elements can be defined within a layered graphics representation of the user interface artwork, rather than individual flattened graphics files. By setting properties on individual user interface elements through the prototyping tool, the artistic team can review how the elements will appear and behave during typical interaction with a user. Furthermore, a description of the interaction properties and relationships of these user interface elements, as defined by the artistic team, is captured for communication to a programming team. The programming team can then load the layered graphical representation and the interaction description to implement the user interface interactivity developed and proposed by the artistic team.