Limestone, a sedimentary rock composed of ancient marine organisms, plays a large role in the work of South Texas–based firm Lake Flato Architects. At the new addition at Witte Museum in San Antonio, limestone “imparts a great sense of civic presence and permanence,” says architect Steve Raike. Photo 4 of 9 in RM-3 Episode Five: Clams

RM-3 Episode Five: Clams

4 of 9

Limestone, a sedimentary rock composed of ancient marine organisms, plays a large role in the work of South Texas–based firm Lake Flato Architects. At the new addition at Witte Museum in San Antonio, limestone "imparts a great sense of civic presence and permanence," says architect Steve Raike.