Includes numerous sketches and designs for unidentified clients.

These folders include sketches and plans for kinetic sculptures and decorative lawn sculptures created and designed by Walter in the barn studio at the Einsel home in Westport Connecticut. Many of these files were kept in flat files in the barn studio after Walter's death in 1998.

These folders contain sketches, plans, correspondence, and documents related to the Age of Information exhibit at EPCOT Center at Disney World for which Walter created a kinetic sculpture installation which remained there through the 1980s into the early 1990s. The subseries Photographs of Series 2. Professional work contains images of the exhibit and its construction.