Over the years, Lacasse deepened his research into the reflection of the sunlight as it was refracted into a prism by an embedded mineral of a stone. His mystical beliefs led him to search for a supernatural union with God and made him strive for ultimate purity in his work. Lacasse commented on his Abstract paintings; ‘I do not know why I find the word ‘abstract’ inapt, for I regard the finished (abstract) painting as something that comes to live, a living object in itself and is therefore the opposite of abstract.’ He continues to say that ‘when the (abstract) painting is born, the painting speaks and acts, the painting has its own life, mysterious and sacred.’
Lacasse was held in high esteem by his friends such as Constantin Brancusi and Robert and Sonia Delaunay, and Michel Seuphor.