Motion and Context Sensing for Pen Computing

Roll to undo figure
Roll to undo/redo a stroke.
Barrel tap
Barrel tap for context menu.
Tilt to reveal layers
Tilt to reveal layers.
Loss prevention
Pen loss prevention.
Pick up pen
Picking up pen brings up menu.
Ink splattering
Simulate ink splattering.
Vertical menu
Vertical posture for marking menu.
Hard contact
Hard contact gesture.