J.k. Rowling said this quote
“ Hello, Harry!” she said.“Er — my name’s Barny,” said Harry, flummoxed.“Oh, have you changed that too?” she asked brightly.“How did you know — ?”“Oh, just your expression,” she said.Like her father, Luna was wearing bright yellow robes, which she had accessorized with a large sunflower in her hair. Once you got over the brightness of it all, the general effect was quite pleasant. At least there were no radishes dangling from her ears. ”