Museum Tower Image

Museum Tower Presents Solution to the
Nasher Sculpture Center Reflected Light Issue

The Solution – a reconfigured oculi sunscreen design for the Nasher Sculpture Center

The following video and animation demonstrates the science and engineering behind the development of a modest change to the Nasher’s existing sunscreen treatment on its glass roof. This meets the Nasher’s request for a 100% solution. Please take a look! 
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Statement from Richard Tettamant:

The Chairman asked me to update the Board on Museum Tower at this time. Museum Tower is internationally acclaimed as one of the most elegant, special residential properties in the world, and it is located right in the heart of the Dallas Arts District.


When we broke ground in 2010, Museum Tower was important for a number of reasons. As the first major construction project since the 2008 recession, it was an important economic stimulus for Dallas. And, it brought residential living to the heart of the city.

Museum Tower was designed and built to LEED Gold environmental standards. City codes everywhere are requiring more energy efficiency in new construction, and high performance glass is the most popular choice in building materials to help meet these tougher green requirements.

It wasn’t until the exterior of our building began to go up that we became aware that the oculi sunscreen system covering the Nasher Sculpture Center’s glass roof was pointed directly at our property. That’s when we learned that our energy efficient glass was reflecting sunlight into the galleries during certain times of the day. This was an unexpected and unintended development.

We’ve worked very hard over the last year and a half to find a way to eliminate the reflection in the Nasher galleries and make the Nasher visitor experience comparable to what it was before Museum Tower was built. However, finding something that works on a 42-story glass building is more complicated than it might seem.

June 13, 2013 Announcement

It gives me great pleasure to announce today that after studying more than 20 ideas, our world class team of engineers, scientists and optical experts have designed, tested, and computer simulated a solution that provides 100% remediation of the reflection in the Nasher galleries.

The good news is that involves only a slight reconfiguration of the Nasher’s sunscreen design. The science, engineering and computer simulation proof of this solution are so strong, Museum Tower, LP has committed to pay for testing on the Nasher, as well as paying for production and installation on the entire Nasher gallery.

And now I would like to show you the oculi-sunscreen solution. The video you are about to see is a compilation of our work, and includes the animation, engineering and science reports presented on April 26th to Nasher Trustees David Haemisegger and Nancy Nasher Haemisegger.

The Nasher trustees agreed to evaluate our proposal. We are anxiously awaiting their response and look forward to working with them to advance this solution. I want to thank the Nasher Sculpture Center and the public for their patience while we searched for a solution.

We invite everyone to review the research, testing and design of the oculi sunscreen system on this website.

I want to personally thank the team of experts, each person spent hundreds of hours working on finding a solution. It became a mission. In particular, I want to thank Dr. Cy Cantrell who guided this international team with not only his expertise in optics and engineering but with his wit and charm also.

Museum Tower Engineers Develop Solution to Reflections on Nasher Sculpture Center

DALLAS (June 13,2013) A solution to the sunlight reflections between Museum Tower and the Nasher Sculpture Center was presented to the Board of Trustees of the Dallas Police and Fire Pension System this morning. The solution represents the conclusion of a year and a half long study, computer modeling and peer review testing by a world class team of engineers, optical scientists and architects that eliminates reflected sunlight from Museum Tower entering the Nasher Sculpture Center galleries. This solution restores the visitor experience in the Nasher galleries to comparable pre-Museum Tower conditions.

Until the exterior of the building went up, Museum Tower developers were not aware that the oculi sunscreen system that covers the Nasher Sculpture Center’s glass roof was pointed directly at Museum Tower property, and that its high performance, energy efficient glass reflected sunlight into the galleries during certain times of the day. This was an unexpected development and an unintended consequence.

Of the more than 20 possible solutions studied by the team of experts, the reconfigured sunscreen system was the only solution found that provides 100 percent remediation of reflected light into the galleries.

On April 26, 2013, Museum Tower representatives presented the solution with complete engineering and scientific reports to Nasher Sculpture Center Board of Trustees President David Haemisegger and Trustee Nancy Nasher Haemisegger. Museum Tower representatives offered to pay for the reconfigured sunscreen system. The Nasher trustees assured Museum Tower’s representatives that the reports would be reviewed by their own engineering team and that they would respond within seven to ten days.

Today, at the request of the Dallas Police and Fire Pension System Trustees, System Administrator Richard Tettamant presented a report on the proposed solution at the Board of Trustees’ regular monthly meeting. The presentation was the same one that was made to the two Nasher trustees and demonstrates delivery on the Pension System’s good faith promise to find the solution and have Museum Tower, LP pay for testing, fabrication and installation.

"We know the newly designed oculi work. This solution has been peer reviewed by the best experts in the country," said Dr. Cyrus D. Cantrell, Ph.D., P.E. "It only requires a slight adjustment to the oculi system of about 45 degrees to completely eliminate unwanted light and any view of the surrounding buildings. This is a beautifully engineered solution."

The impact of reflected light on the Nasher’s garden has been carefully observed for over one year and according to Scott Ogden, a nationally known horticulturist and garden designer, “Reflections from Museum Tower have no demonstrable effect on the vegetation in the Nasher garden, there is no damage from sunlight reflected by the Tower, that the garden is doing well and will continue to do so.”

Science and engineering reports, computer animation, expert interviews and garden study can be found at

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