Bernini's Baldacchino at St.Peter's solved the problem of providing:

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Bernini's Baldacchino at St. Peter's solved the problem of providing a focal point for the interior. It stands as a grand central feature in the vast space of St. Peter's, drawing the eye and providing a sense of scale and harmony to the interior. While it does provide some shade for the altar area, and it is located beneath the dome, it was primarily designed to give a sense of grandeur and awe to the space, rather than to solve practical problems such as providing shade or an entrance to the dome.