My long-standing couple crush on Swedish artists Jockum Nordström and Mamma Andersson may have just intensified.  “Who is sleeping on my pillow,” their first collaborative show at David Zwirner, is brimming with work that has been soaked, scratched and fondled. Nordström’s collages are perverted, yet tender; Andersson’s paintings are intimate yet aloof. Both shows, independently, are breathtaking, [...]