Guillem S. Arquer (b. 1994, Barcelona) lives and works in Rotterdam, NL. Ki has a diverse educational background, starting with an engineering background before transitioning to the arts. ​Ki completed a BA Fine Arts at the Universitat de Barcelona and an MFA Fine Arts​ at the Piet Zwart Institute in Rotterdam. In 2024, he participated in the Postnatural Independent Program of the Institute of Postnatural Studies in Madrid.

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Selected exhibitions, workshops and events include: Prospects at Art Rotterdam, Rotterdam, 2025; Nature of Hope, Internationale Architectuur Biënnale Rotterdam (IABR), Rotterdam; Sustaining Small Acts, TENT, Rotterdam, 2023; Shared Grounds, Rib, Rotterdam, 2023-2025; Springboard Art Fair, Utrecht, 2023; Garage School: Underground for Radical Symbiosis: The Social Life of Microbes, Radius, Delft, 2023; PANORAMA 3, Galeria Fran Reus, Palma de Mallorca, 2019; XXI Biennal d'Art Contemporani Català, Sant Cugat, 2018. Ki published 'terra incognita' (2019) with Centre d'Art La Panera de Lleida, 'Becoming humus: Surrendering Consciousness' (2024) in 'A book for Disappearance' with cthulhu books and 'Talking Soil' (2024), in collaboration with Kate Price, with TENT Rotterdam. Ki self-published and distributed 'Happy worms in optimal luxury environments' (2021). Ki was granted by Sala d'Art Jove of the Generalitat de Catalunya, 2018; by CBK Rotterdam 2023; by Cultuur Concreet, 2023; by Opzomeer Mee, 2023; Mondriaan Fonds, 2023-2024. Ki has been an artist in residence at Decompression Gathering Camp, Borgo San Lorenzo, Italy, 2018; Nauestruch Fàbrica de Creació, Sabadell, 2018-2019; Piet Zwart Institute, 2022; Goethe-Institut Niederlande, Rotterdam, 2023.