The document discusses the reasons for choosing several symbols and items: a thistle was chosen because it is popular in Scotland; the Scottish flag was chosen because the author's ancestors came from Scotland; a Macmillan hunting tartan was chosen because the author is part of the Macmillan clan; a symbol was chosen because it is the Macmillan crest; a Lamborghini Aventador was chosen because it is one of the author's favorite cars.