Interaction is a noun. Vaguely, it can be used to mean some force affecting another. The cue striking the eightball would be an example. But this could also be described as a reaction. in that sense, we could consider one use of ‘reaction’, as in a chemical reaction. There, chemicals react predictably. To act is to perform some action, but also initiate some action. Thus,  intentionality seems to be implied in the word ‘interaction’.

“Inter” means between. While this could be the action of one body towards another, it is better captured by the sense of two or more bodies acting upon one another. Thus while one pool ball may be deformed when it impacts another, this is not the same category as when a person gestures at another. The struck pool ball has no intentionality towards the first. The change in the first pool ball is due to its motion and conveys no intentionality. In the second case, the act of waving (a gesture) may change the person waving. They may anticipate a smile or a wave back.

So, my brief account here defines interaction and its various conjugations as describing a change in the initiator of the interaction as much as the object. Indeed, it would be a mistake not to consider both (or more) parties as subjects.

One attempt to think about the relationship between spectators and interactive art is presented by Carlos Castellanos.

“Symbiogenic experiences are those that give rise to a sense that we are co-emergent, that is, that we exist in mutually influential relationships with our increasingly technological environment.” Castellanos 2016

Castellanos, Carlos. “Co-evolution, neo-cybernetic emergence and phenomenologies of ambiguity: Towards a framework for understanding interactive arts experiences.” Technoetic Arts 14, no. 3 (2016): 159-168.