  We are developing an interactive graph exploration system called Graph
Playground for making sense of large graphs. Graph Playground offers a fast and
scalable edge decomposition algorithm, based on iterative vertex-edge peeling,
to decompose million-edge graphs in seconds. Graph Playground introduces a
novel graph exploration approach and a 3D representation framework that
simultaneously reveals (1) peculiar subgraph structure discovered through the
decomposition's layers, (e.g., quasi-cliques), and (2) possible vertex roles in
linking such subgraph patterns across layers.
