Art and computational technologies have converged, leading to movements like Interactive Digital Art, which uses digital interfaces to foster interaction between audience and artwork. Semiotic Engineering, from Human-Computer Interaction (HCI), provides a framework for improving how designers communicate intent through interfaces. This paper presents Astra, an interactive digital artwork developed at the intersection of artistic expression and HCI concepts. Beyond being a digital piece, Astra serves as a medium of self-expression for the artist-designer. It enables users to engage meaningfully with embedded messages, emphasizing communicability and the aesthetic potential of interactive systems.