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Who We Are

The Creative Leaders in Design and Construction

As the leaders in rockwork, water features and themed environments, Outside the Lines brings a team of knowledgeable and reputable designers, estimators and project managers to your project, no matter what its size and scope.

OTL is recognized throughout the industry for our artistic ability, disciplined approach to engineering and construction management and sound and ethical business practices.

Provide the World’s Finest Rockwork, Water Features and Themed Construction

OTL is headed by J. Wickham Zimmerman and Hugh F. Hughes, leaders in the industry. When they founded OTL, they focused on providing the world’s finest rockwork, themed construction and specialty water feature projects.

After its formation, OTL immediately established itself as the touchstone for the industry, and the company’s excellent reputation grew quickly throughout the architectural community.

We Make Projects Geo-Believable
OTL is committed to providing and preserving the world’s finest habitats, waterscapes, landscapes, and natural environments.

We studied, learned and even coined the phrase “geo-believability,” the art of making rockwork and water features as geologically realistic as possible. If you’re seeking a realistic, natural setting, every stream we build will flow and bend the way nature intended and every artificial stone we create will look indigenous to the area.

Or Out of This World
If you’re seeking an environment that’s more other-worldly, our rock, water and themed features make the mundane disappear and bring out the magic and wonder of your project.

The team at OTL has created some of the most imaginative and mind-bending themed environments in the industry. We’ve created water features that dance to the music of Frank Sinatra and re-created the snow-capped mountains of the Swiss Alps.

As skilled artisans, our work is restricted only by your imagination.


  • OTL to Build Natural Habitat for Detroit Zoo’s Penguin Exhibit

    OTL has been selected to construct natural habitats for the 33,000-square-foot Polk Family Penguin Conservation Center under construction at the Detroit Zoo in Royal Oak, Mich. The $29.5-million expansion is the zoo’s largest project to date and will be the largest center in the U.S. dedicated solely to penguins. The freestanding zoological exhibit, constructed on […]

  • OTL Moves to the Next Round in Chase Bank’s Mission Main Street℠ Grants Program

    Outside the Lines exceeded the vote count required to move to the next round in Chase Bank’s Mission Main Street Grants program. A panel of judges will now review applications to determine which small businesses will receive one of 20 $150,000 grants distributed by the program. Recipients will be announced in January. “The response by […]