St. Peter's Lutheran Church, Columbus, Indiana, 1980-1988

[Conceptual Sketch of Roof], untitled. Black and blue ink sketch on tracing paper, 24x33 inches [from photographic copy by Lance Burgharrdt]

St. Peter's Lutheran Church, Columbus, Indiana, 1980-1988

[Conceptual Sketch of Roof], untitled. Blue ink sketch on tracing paper, 18 x 31 3/4 inches [from photographic copy by Lance Burgharrdt]

St. Peter's Lutheran Church, Columbus, Indiana, 1980-1988

[Conceptual Sketches of Roof], untitled. Ink sketches on tracing paper, initialed, 12 x 21 1/4 inches [from photographic copy by Lance Burgharrdt]

Domino's Farms Tower, Ann Arbor, Michigan, 1987-1988 (unbuilt project)

[Conceptual Sketch of Roof], untitled. Blue ink sketch on tracing paper, 22x12 inches [from photographic copy by Lance Burgharrdt]

Domino's Farms Tower, Ann Arbor, Michigan, 1987-1988 (unbuilt project)

[Conceptual Sketch of Roof], untitled. Ink sketch with yellow marker coloring on tracing paper, 12 x 16 1/4 inches [from photographic copy by Lance Burgharrdt]

Domino's Farms Tower, Ann Arbor, Michigan, 1987-1988 (unbuilt project)

[Conceptual Sketch of Roof], untitled. Ink sketch on tracing paper, 12x17 inches [from photographic copy by Lance Burgharrdt]

University of Michigan Sports Services Building, Ann Arbor, Michigan, 1985-1990

[Early Roof Study], untitled. Blue ink sketch on tracing paper, 12 x 24 1/2 inches [from photographic copy by Lance Burgharrdt]

University of Michigan Sports Services Building, Ann Arbor, Michigan, 1985-1990

[Early Roof Study], untitled. Black and blue ink sketch on tracing paper with blue and orange marker coloring, 18x28 inches [from photographic copy by Lance Burgharrdt]

U. S. Embassy Office Building, Helsinki, Finland, 1975 (unbuilt project)

[Roof Study], untitled. Ink and blue pencil sketches on tracing paper, 15 1/2 x 18 inches [from photographic copy by Lance Burgharrdt]

U. S. Embassy Office Building, Helsinki, Finland, 1975 (unbuilt project)

[Roof Study], untitled. Ink sketches on tracing paper, 17x18 inches [from photographic copy by Lance Burgharrdt]

Sports and Civic Stadium, Venice, Italy 1989-1992 (unbuilt project)

[Roof Study], untitled. Ink sketch on tracing paper with purple marker coloring, 18 x 20 3/4 inches [from photographic copy by Lance Burgharrdt]

Sports and Civic Stadium, Venice, Italy 1989-1992 (unbuilt project)

[Roof Study], untitled. Ink sketch on tracing paper with purple marker coloring, 18 x 22 3/4 inches [from photographic copy by Lance Burgharrdt]

Sports and Civic Stadium, Venice, Italy 1989-1992 (unbuilt project)

[Roof Study], untitled. Ink and red crayon sketch on tracing paper, 18x19 inches [from photographic copy by Lance Burgharrdt]

Sports and Civic Stadium, Venice, Italy 1989-1992 (unbuilt project)

[Roof Study], untitled. Ink sketch on notebook paper, 8 1/2 x 11 inches [from photographic copy by Lance Burgharrdt]

Pompeo Leoni Private Residential Project, Milan, Italy, 1992-1994 (unbuilt project)

[Conceptual Sketches of Elevation and Roof Axonometric], untitled. Ink sketches on two facsimile prints, 8 1/2 x 17 1/4 inches [from photographic copy by Lance Burgharrdt]