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Listening Vessels at Houston Discovery Green Park

I live in Houston and have worked as a nurse. I have a lifelong passion for traveling, nature, and photography (preferably all together!).

Listening Vessels at Discovery Green Park in Houston

Listening Vessels at Discovery Green Park in Houston

Listening Vessels

The Listening Vessels found in downtown Houston’s Discovery Green Park are amazing! Two of these stone sculptures are situated 70 feet apart, with their concave interiors facing one another. People can sit in these sculptures, whisper, and hear one another from 70 feet away!

The hollowed-out interiors concentrate sound waves, which is the fundamental reason why this works.

Artist and Donor Information

Artist and Donor Information

Houston Philanthropist

Maconda Brown O’Connor was a well known Houston philanthropist. She left a significant imprint upon our beautiful city with her good works and deeds.

There is a bronze relief heart-shaped sculpture created as a tribute to her not far from the Listening Vessels. Anyone visiting the south side of Discovery Green Park can easily view both sculptures.

Artist Doug Hollis

Doug Hollis is a well known American artist (born 1948) in Ann Arbor, Michigan. He earned his Bachelor of Fine Arts degree from the University of Michigan.

Mr. Hollis got to know Frank Oppenheimer, who was an educator as well as a physicist. Oppenheimer founded the Exploratorium in San Francisco. It is now at Pier 15 at the Embarcadero.

At the interactive Exploratorium museum, visitors enjoy all types of experiences having to do with art, science, and human perception. One such lesson is described as being able to dance in the middle of a tornado! That sounds truly amazing! If my husband and I ever make another trip to San Francisco, I would like to spend part of a day at the Exploratorium.

After becoming an artist-in-residence at the Exploratorium and getting to know Frank Oppenheimer, Doug Hollis became fascinated with sound sculpture. Isn’t it interesting how our life paths can change just by our associations with the people around us!

There are now many works of art by Doug Hollis in various parts of our country. Some of his sound sculptures are permanent, and others have been temporary pieces of public art. Water and wind are the sources of sound in some of his creations.

The Listening Vessels by Doug Hollis in the Wortham Foundation Gardens in Discovery Green Park consist of Alabama limestone.

Listening Vessels at Discovery Green Park

Listening Vessels at Discovery Green Park

About Limestone

Limestone is a fascinating, singular subject. According to Wikipedia, “About 10% of sedimentary rocks are limestones.” Sedimentary rock has been compressed over many centuries and originated from shelled sea creatures. Oceans once covered much of the land we see today, including even that of mountaintops!

Most caves and reefs contain limestone. Limestone is often used in architecture, art, and more practical purposes. Did you know that the Great Pyramid of Giza is covered with limestone?

While much limestone comes from Alabama, the largest limestone quarry is in Michigan. The states of Wisconsin and Indiana account for the vast majority of limestone, which is almost 90% of the production in the United States.

Listening Vessels at Discovery Green Park

Listening Vessels at Discovery Green Park

Gauging of Sounds Before Radar

This story gets even more exciting! It goes back to World War I.

Long before the invention of radar, some relevant research took place by Dr. William Sansome Tucker. Back in those days, it was more challenging to pinpoint enemy guns and aircraft. “Sound ranging” is the gauging of sounds made by gunfire or an approaching plane.

The use of microphones combined with mathematics under Dr. Tucker’s direction leads to more convenient methods of identifying enemy forces as they approached. Eventually, his early warning devices about the noise discharged guns made lead to the invention of parabolic acoustic mirrors made out of concrete. It was easier with those “listening ears” to identify incoming enemy aircraft.

Some of those old concrete acoustic mirrors are still standing along England’s coastline as well as one in Malta.

An example of them in Denge is in the photo, as well as the video below.

As airplanes became faster, the acoustic mirrors became less effective. Often by the time the airplane sounds were detected, they were already overhead. The concrete sound mirrors became instantly obsolete with the invention of radar in 1932.


Whisper Dishes

Similar acoustic “whisper dishes” such as we experienced at the Houston Museum of Natural Science at Sugar Land are also found in other science museums. They all are similar to these in Discovery Green Park.

The focusing of sound is certainly a fascinating subject. Don’t you feel smarter today after reading this?

Shown below is a video of people enjoying various aspects of our beautiful downtown park called Discovery Green. It does not feature everything in the park, but for people living outside of Houston, it gives an overall impression.

The location of Discovery Green Park where the Listening Vessels are, is the following: 1500 McKinney St., Houston, Texas 77010.


This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

© 2020 Peggy Woods


Peggy Woods (author) from Houston, Texas on March 30, 2020:

Hi John,

We experienced the wonder of them in this park as well as in a Sugar Land museum. These sound vessels are amazing, and I enjoyed learning the history of them.

John Hansen from Gondwana Land on March 30, 2020:

Peggy, I certainly do feel smarter after reading this. I had never heard of these sound vessels before. Houston Discovery Green Park certainly sounds like an interesting place to visit.

Peggy Woods (author) from Houston, Texas on March 28, 2020:

Hi FlourishAnyway,

So glad you enjoyed this post. Combining art and science can be fun!

FlourishAnyway from USA on March 27, 2020:

I love the blend of art and science—something for everyone! This was a most interesting article and I would love to visit.

Peggy Woods (author) from Houston, Texas on March 27, 2020:

Hi Liz,

I appreciate your comment. These structures are indeed fascinating!

Peggy Woods (author) from Houston, Texas on March 27, 2020:

Hi Karen,

It is wonderful that you got to share that experience with your daughter in a museum setting.

Liz Westwood from UK on March 27, 2020:

I always find these kind of structures amazing. I appreciate your background information.

Peggy Woods (author) from Houston, Texas on March 27, 2020:

Hi Manatita,

Yes, there is much philanthropy in our part of the country. Thanks for your visit.

Peggy Woods (author) from Houston, Texas on March 27, 2020:

Hi Bill,

It made sense with the title of my website...ExploreHoustonWithPeggy. More people are already viewing my posts here than on that site, so I think it is a good move on my part.

Peggy Woods (author) from Houston, Texas on March 27, 2020:

Hi Raymond,

It is with great pleasure that I can showcase some of the sites in and around our metro area. So pleased that you are enjoying learning about Houston and what we have to offer tourists.

Karen A Szklany from New England on March 27, 2020:

Great article, Peggy! We have played with sound dishes like this at the Acton Discovery Museum in Acton, MA. It's about a 25 minute drive from us and I brought my daughter there when she was young. Fun!

manatita44 from london on March 27, 2020:

Dengue mirrors and Whisper Dishes. How original! Great fun to see the kids play. Philanthropists seem to play a large part in your culture and heritage. Excellent!

Bill Holland from Olympia, WA on March 27, 2020:

I love that art.

You must be one of the leading authorities on Houston. I think that is very cool that you have taken such an interest in all that is Houston.

Raymond Philippe from The Netherlands on March 27, 2020:

Peggy, the more I read about Houston the more I feel I am missing great sights, sounds and tastes. Who needs a tourist information, when we have you!

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