This work describes a novel approach to utilizing everyday objects of users as additional, auxiliary, and instant tabletop controllers. Based on this approach, a prototype platform, called iCon, is developed to explore the possible design. Field studies and user studies reveal that utilizing everyday objects such as auxiliary input devices might be appropriate under a multi-task scenario. User studies further demonstrate that daily objects can generally be applied in low precision circumstances, low engagement with selected objects, and medium-to-high frequency of use. The proposed approach allows users to interact with computers while not altering their original work environments. Author Keywords Tangible User Interface, Everyday Object, Tabletop Controller. ACM Classification Keywords H.5.1 Information Interfaces and Presentation: Multimedia Information Systems; H.5.2 Information Interfaces and Presentation: User Interfaces General Terms Design, Experimentation, Human Factors.