The group of seven sculptures at the beginning of Rosemont bridge is called Tolerance. It represent the seven continents and are made of all the letters from the different alphabets. It is the work of Jaume Plensa. Another public work of his in the USA is the Crown Fountain at Millennium Park in Chicago -->[ https://pbase.com/ngruev/image/129212257
For more information on the Rosemont bridge, please click the link -->[ http://www.houstontx.gov/abouthouston/rosemontbridge.html