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HCI is driven by the creation and realization of interactive artifacts. Whereas empirical contributions arise from descriptive discoverydriven activities (science), artifact contributions arise from generative design-driven activities (invention). Artifacts, often prototypes, include new systems, architectures, tools, toolkits, techniques, sketches, mockups, and envisionments that reveal new possibilities, enable new explorations, facilitate new insights, or compel us to consider new possible futures. New knowledge is embedded in and manifested by artifacts and the supporting materials that describe them. Artifact research contributions are evaluated according to the type of artifact that gave rise to them. They are often accompanied by empirical studies but do not have to be, and sometimes should not be [4]. New systems, architectures, tools, and toolkits are evaluated in a holistic fashion according to what they make possible …