The Philadelphia Museum of Art has acquired a series of nine studies by Andrew Wyeth. The studies are a gift from Wyeth’s family, who were impressed enough by a private tour of the museum’s Wyeth retrospective to offer up the additional works, which show “how Wyeth’s thinking evolved before he arrived at the final eerie image of a place setting absent a diner” in his painting, Groundhog Day, which is part of the museum’s permanent collection.