Dossier: Artists' Artists: Marwa Arsanios, Korakrit Arunanondchai, Tania Candiani, Lubaina Himid, Samson Kambalu, Suki Seokyeong Kang, Rodney McMiliian, Ashland Mines and Christodoulos Panayiotou choose a coUeague whose work has been on their mind.