IPA: /ˌæn.tiˈrɪə.lɪ.zəm/
KK: /ˌæntiˈriːəlɪzəm/
A belief or theory that denies the existence of an objective reality, suggesting that certain things may not be true or false.
The artist's work reflects a strong sense of antirealism, challenging the viewer's perception of reality.
Antirealism is formed from "anti-" (meaning against) and "realism" (from Latin "realismus", meaning the doctrine of reality). The word describes a philosophical stance that opposes the idea of an objective reality independent of perception.
Think of 'against' ('anti-') the idea of 'reality' ('realism') — that's what antirealism means.