A new museum in the German resort town of Baden-Baden, built to house a private art collection in a setting open to the public, is a low-profile but important architectural triumph from American architect Richard Meier. “Modest in size and appealing in scale, it is quintessential Meier, a condensation of his complex architectural vocabulary into an intensely beautiful pavilion in a park. Visiting it makes one appreciate (again) how stubbornly consistent Meier has been over the past four decades about the means and ends of architecture — and how stupendously good he can be.”