In this paper we introduce the TessalTable, a collaborative play system for learning about tessellations and symmetry through augmented pattern blocks. Children use tiles to pick up a piece of an image or video. The tiles act as containers for visual content which can be arranged and rearranged anywhere on the application surface. The tile-based controls allow for simultaneous multi-user input. A preliminary study found that children understand and engage with the interface. The ability to arrange and rearrange dynamic images invites users to explore geometric patterns and connected motion. Author Keywords Tangible User Interface, Creativity, Building Blocks, Input Device, Collaboration, Children ACM Classification Keywords H.5.2 Information Interfaces: User Interfaces General Terms Design, Experimentation