As the process of selecting the architect who will design and build the memorial to the victims of 9/11 progresses, other architects are weighing in on the finalists. Some say all the designs are too complex, while others complain that minimalism is too dominant across the board. “Many of the architects had practical questions: What happens to all those water features in case of drought? Can such vast spaces underground be free of columns? How many people can cross a narrow bridge at one time?”