In 2017’s Goldsmiths Prize-winning novel H(A)PPY, Nicola Barker strewed pages with multicoloured text. The Cauliflower, her joyful previous offering, employed winky-face emoticons while telling the story of a 19th-century Hindu mystic. In her 13th novel I Am Sovereign, huge fonts careen, in the space of an exclamation, into tiny fonts.