A [[User]] can [[Perceive]] an [[Artefact]] to identify its presence. Different [[Facet|Facets]] of an [[Artefact]] can accomodate different [[Sense|Senses]]:
- A [[Visible]] [[Facet]] can be [[Perceive|Percevied]] using [[Sight]].
- An [[Audible]] [[Facet]] can be [[Perceive|Percevied]] using [[Hearing]].
- A [[Tactile]] [[Facet]] can be [[Perceive|Percevied]] using [[Touch]].