Walker is known for his sculptures and installations relating to architectural scale and spatial perception and utilizing industrial materials like steel, aluminum, and glass. Standing only four feet tall, Walker explores minimalism from his unique point of view. The installations respond to rule-based, mathematical principles that derive from Walker’s own height and correlate to the experience of navigating a world that has been designed for others.The works at the Pietà interact with the historic architecture of the Pavilion and are all, in some way,transparent. It intrigued Walker that the Pavilion is open at both ends, with each end offering a different destination, the canal or a garden. There is no front or back, and no beginning or end. In the past, Walker has used transparent materials like glass and Plexiglas to create sculptures; this time, the installation itself will be transparent though the actual materials — metal and vinyl — are opaque.