From the Wyly, where balconies are hung from the rafters on a stadium scoreboard-like system, to the Winspear, where the orchestra pit rises on an elevator floor to accommodate extra seating, the venues' flexibility came up again and again.

Lanscape artist Michel Desvigne was on hand to explain how his design for Sammons Park (between the Wyly and the Winspear), long on grids and cement, is meant to mesh with the city around it, while Foster was happy to point out the design features -- down to the angle of the blades in the canopy around the Winspear -- that make the Winspear fit perfectly in Dallas. "I couldn't imagine it anywhere else," Foster said.

If you want to hear more from the architects, Foster's holding a free architecture forum tomorrow at 10:30 a.m. in the Winspear, and Prince-Ramus will be chatting in the Wyly at 2 p.m.

Or you can take a tour with them all here in our slide show.

• Arts