Empathic Interaction: Design Guidelines to Induce Flow States in Gestural Interfaces Topics: Design Methods and Tools; Social Agents and Emotional Interaction; Usability and User Experience; Virtual, Augmented and Mixed Reality In Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - Volume 2: VISIGRAPP, 160-167, 2019 , Prague, Czech Republic