The sky lobby on the 60th floor of the I.M. Pei-designed Chase Tower offers the kind of view that gets kids oohing and asking really deep questions. "What would happen if there was no glass here?" queried one little girl as she and her brother pressed against the floor-to-ceiling window, peering over pulsating downtown to the smoky horizon. Dad cut in, hoping perhaps to turn the girl's thoughts from her mortality, and asked chipperly, "Do you know what that is?" "The Astrodome!" his kids chimed in unison. From up here in the clouds you can see the Bayou City's industrious heart melt into the peaceful spaces of the distant countryside to the south and west. Traffic-clogged arteries like I-45 and U.S. 59 snake past the city, while a grid of inner-city streets bisects the clusters of buildings and patches of green. The Galleria and the Texas Medical Center look like toy cities from these dizzying heights. Gracing the lobby are sculptures by Miró and a useful map to help identify the many gleaming buildings below.READERS' CHOICE: Scott Gertner's Skybar