“Everything I do here I do with pleasure, and I admit I’m a bit ashamed of that,” says the Cologne-based artist Claus Richter. And a visit to his exhibition “Living in another world” offered a similar experience of guilty pleasure. I laughed at the kitschy plastic orchids in his Singing flowers/Omi Ursula (all works 2017), which hop up and down while singing in what sounds like a squeaky girl’s voice (actually the artist’s), and at the robot in Your little helper (Robot). The latter is a beat-up R2-D2–like mechanical butler whose loose wires hang out of its insides and which kept assuring me,