David Blandy, Robert Therrien, Jenny Holzer: this week’s new exhibitions

David Blandy | Robert Therrien | Jenny Holzer | Hannah Collins | Henri-Gaudier Brzeska | Reality | Jennet ThomasDavid Blandy appears to be casting off his mantle as the art world’s premiere disciple of geek pastimes. In the last decade, his love of manga, kung-fu movies, computer games and hip-hop has lead to pop-savvy work exploring global fandom and cultural colonialism, in which the skinny, bespectacled boy often cut a deliberately incongruous figure. His new video installation exploring Lo