His interest in art derives from collecting stamps which featured famous French artists as a teen, as well as his grandmother's amateur painting practice.

[5] Cornet organised and curated exhibitions of Irish visual art in various locations in Dublin under the name "Olliart" from 2004.

[6] It represents the artists Annika Berglund, Hugh Cummins, Jordi Forniés, Conrad Frankel, Eoin Mac Lochlainn, Miriam McConnon, Yanny Petters, Kelly Ratchford and Susanne Wawra.

[11][12] Themed shows have centered around topics such as climate change, the environment, identity, notoriety and fake news.

[13][14] The gallery also curates a show annually for the June Bloomsday festival in Dublin, each time choosing a different theme related to James Joyce's novel Ulysses.