Tangible User Interfaces (TUIs) have been used in many learning contexts. However, its application in the remote collaborative learning area remains relatively unexplored. In this study, we contribute to this use case with GrouPen. It is a TUI prototype embedded in a regular pen, thus allowing easy-to-use tangible interaction. We showed how it could be used to enable and enhance collaborative learning and engage students. GrouPen uses natural gestures to show statuses in several learning phases. We evaluated the prototype using a survey that yielded positive feedback and supported the hypothesis that TUIs like GrouPen could facilitate learning connectedness and engagement.