Works made for exhibition and judged by a public. They are design precedents, not academic evidence — none carries a formal user study, and what is known about how people behaved in them comes from the makers’ own accounts.
That is worth stating plainly, because these are the most persuasive works in the collection. They are the ones with the budgets, the photographers and the crowds, and it is easy to let a good photograph stand in for a finding.
Close call. Cave of Sounds also has a NIME 2014 paper and could sit under music-hci. It is here because the page describes the touring installation — Barbican, V&A, Athens, Milan — rather than the paper.