In this paper, we implement a computer mouse for demonstrating the idea of form-function synchronization by embedding deformation sensing modules consisting of deformable foam and Hall-effect sensors. Due to its automatic sensing, recognizing and actuating mechanisms actively responding to users' diverse gestures, we have chosen to name it Adaptive Mouse. Working with Adaptive Mouse, all users have to do is to hold it with preferred hand gestures, then through the use of their fore and middle fingers the correct button functions will intuitively be triggered. Users can also freely move the mouse and always get accurate cursor feedbacks. This "intuitive holds then clicks" action creates sense of "magic", and the mouse shape with minimum visual clues not only lowers mental loads but also achieves the goal of simplicity design.