We present MTVis, a multi-touch interactive tree visualization system. The multi-touch interface display hardware
is built using the LED-LP technology, and the tree layout is based on RINGS, but enhanced with multitouch
interactions. We describe the features of the system, and how the multi-touch interface enhances the
user's experience in exploring the tree data structure. In particular, the multi-touch interface allows the user
to simultaneously control two child nodes of the root, and rotate them so that some nodes are magnified, while
preserving the layout of the tree. We also describe the other meaninful touch screen gestures the users can use
to intuitively explore the tree.