The 'interior' shape of the Quasi Modern (Quasi) sculpture series mimics the exterior silhouette of the Solid Vase Form. After cutting circles from squares of glass to form a solid 'block' of glass in the form of a vase, Sidney began using the cut space from the squares to construct an interior carving of a vase. As the series and his machining interested evolved, the Quasis were mounted on the wall using machined aluminum. This created a new dimension for his work.

The process of creating the Quasi begins with squares of glass. To remove the circle from the center, angled relief cuts are made from the edge of the circle to the corners to create the Quasi Modern series. Each piece is laminated using dyed and pigmented adhesive.