The postponement of a traveling retrospective of the work of artist Philip Guston — namely, his depictions of the KKK — set off outrage in the art world in September. Pictured here is one of the paintings, “Riding Around,” on display in 2014 in Hamburg, Germany. | Getty Images 2020’s racial reckoning has rocketed through elite cultural institutions. Undoing old patterns means untangling nearly everything. Part of The Museums Issue of The Highlight, our home for ambitious stories that explain our world.