Takashi Murakami’s exhibition, “In the Land of the Dead, Stepping on the Tail of a Rainbow,” at Gagosian. Photo: 2014 Takashi Murakami/Kaikai Kiki Co., Ltd. All Rights Reserved. Photography by Robert McKeever. Courtesy Gagosian Gallery. There’s always a theme-park-like quality to any Takashi Murakami show: the cutesily deranged, insistent candy colors and anime characters, which both seem to be de