Following a residency at the Slade School of Fine Art in London in 1965, Tousignant continued to be influenced by the Plasticiens in his large geometric paintings and folded serigraphs, wanting to go beyond the traditional frameworks of the medium. These three works by Tousignant consist of layered serigraphs of solid colour and equal size that have been uniquely folded and sandwiched between two sheets of diamond-shaped acrylic glazing. As a result of this folding, the bands of visible colour accentuate the illusion of three-dimensional forms in space. The "Diamond" series directly informed and influenced the artist's folded steel works in 1968, where he focused on exploring conceptual notions about process and idea in art making. Tousignant shifted away from the production of an aesthetic art object towards working with metal, glass, mirrors and folded paper, exploring the creation of perceptual illusions.