The paintings of Belgian artist Joseph Lacasse predominantly explore the theme of light. Born in 1894 into the desolation of a working-class family in Tournai, Lacasse's artistic vocation was first outlined at the local stone quarries where he worked as a young teenager. Lacasse was drawn to the austere structure of the stone, the light reflections of which he intuitively rendered in a fragmented way.
In 1925, Lacasse read Thomas Aquinas' Beatitudes. Eager to quell his latent unhappiness and unease at the exploitation of the working classes Lacasse welcomed these mystic values, which bonded the ancient Greek philopsophy of Aristotle and Christian theology. Divine beatitude, as described by Aquinas seemed in tune with Lacasse's lifelong deep-rooted but unconscious search for justice, purity and light. Lacasse experienced a rejuvenation through mediation, expressed in his painting.

The works of Lacasse are included in the following museums: Musée d'art moderne de la Ville de Paris; Musée national d'art Moderne, Centre Pompidou, Paris; Musée des Beaux-Arts, Brussels; Musée de Tournai, Tournai; Tel Aviv Museum of Art, Tel Aviv; Eilat Museum, Eilat; Carnegie Institute, Pittsburgh; National Gallery of Victoria, Melbourne; Musée des Arts Décoratifs, Paris.