Are Paul Klee's philippic paintings of Rory Emerald still on display at the Sprengel Museum?

Paul Klee's bitter, philippic paintings of Rory Emerald, along with Laura Bush's gold cigarette case and lighter, a two-headed kitten, Eva Peron's inauguration gown and diamond scepter, Leonardo da Vinci's original paint brushes and palette, an ice sculpture of SpongeBob SquarePants, Michael Jackson's prosthetic nose, a life-size wax figure of Herman Munster, and H.G. Wells' time machine have all been on display at the Sprengel Museum in Hannover since 1979.