Cruz and Gaudron sketch the concept of open-ended objects that are positioned as facilitating brainstorming workshops for human-computer interaction (HCI) purposes.

Open-ended objects are characterized by four features: those that provide a preliminary experience, a tangible representation of a question, an interactive experience, and an intentionally incomplete experience. This set of features is envisioned to provide a participatory atmosphere among participants in the brainstorm session and catalyze an experience perspective on the issue at hand.

The idea behind open-ended objects is appealing. However, its description is more a sketch of an idea than a scientifically sound introduction of a new concept. Moreover, much work has already been done on probing experiences [1] and related endeavors, such as interactive art, shared mental models, and visual languages, starting with the work of Rudolf Arnheim [2]. It is a shame that Cruz and Gaudron seem to be unaware of the vast amount of work related to theirs.