When confronted with the renovation of a dull, one-story, brick- and glass-block-clad library with a 100-foot-deep floor plate, there are some obvious moves an architect can make. Redesigning the street-facing elevation to be more welcoming from the exterior and more porous to the interior is one such move. Reorganizing the floor plan is another. But to really make a difference in what was a dark and gloomy space, punch giant holes in the roof and bring in daylight.