Looking back at Lacasse's individuality and all counter-movements in mind, it should at present be possible to grant Lacasse the position he deserves. As a pioneering abstractionist and a Tachist 'avant la lettre', Lacassse 's preoccupation always remained with the effects of the light and its prism broken down on the glistening rock, which he encountered during his youth at the stone quarries of Tournai. As such Lacasse communicated energy and harmony through line and form, freed from their descriptive functions.
During the 1950s Lacasse experimented with the techniques of collage and dechirage, which were first introduced by Dada in general and applied by Kurt Schwitters in particular.

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.