
Nautical architecture: study 1. Photo of the Hercules, a tugboat berthed at the Hyde Street Pier, San Francisco Maritime National Historical Park, San Francisco, California.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.

Op art agave. Photo of thin spikes of an agave in the Strybing Arboretum, Golden Gate Park, San Francisco, California.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.

Geologic medallion. Photo of ribbon chert exposed by road cut, Marin Headlands, Golden Gate National Recreation Area, California.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.

Temple of Botany altar piece: model 1. Photo close-up of heliconia bract, Paraiso de Heliconias, San Vito, Costa Rica.

Temple of Botany altar piece: model 2. Photo close-up of heliconia bract, Paraiso de Heliconias, San Vito, Costa Rica.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.

Upstairs/downstairs. Photo of stairs on exterior of small oval building housing restrooms in Aquatic Park complex, San Francisco Maritime National Historical Park, California. Stairs led to a flat roof originally used as a lifeguard station for the park.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.

Leaf geometries: version 1. Photo close-up of bromeliad leaves, Paraiso de Heliconias, San Vito, Costa Rica.

Leaf geometries: version 2. Photo close-up of bromeliad leaves, Paraiso de Heliconias, San Vito, Costa Rica.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.

Florist’s dream? Photo of anthurium flower with spadix and leaf, Paraiso de Heliconias, San Vito, Costa Rica.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.

Reflective distortion. Photo of the reflection of a construction crane in the side of a glass-clad building, San Francisco, California.
© Harry Hull III and Mandalagraphs.com, 2013. Unauthorized use and/or duplication of photographs and other material on this blog/website without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Harry Hull III and Mandalagraphs.com with appropriate and specific direction to the original content.