Things have changed quite a bit since we began Sight Unseen eight years ago, but one interview question has remained steadfast in our arsenal: Who are your biggest influences? And while the same answers tend to pop up often enough — Barbara Hepworth, Agnes Martin, Luis Barragán, Donald Judd — there's one name that seems to get checked more than anyone else: Josef Albers, the 20th-century artist, educator, and designer, whose book, Interaction of Color, is one of the most essential design texts ever written. But in a new exhibition at the Guggenheim, Josef Albers in Mexico, one of Albers's own greatest influences is laid bare.