The text_wf variation incorporates a line of text into a flame. It is a blur variation like circleblur and starblur, meaning it ignores the input and just generates a shape; but instead of the shape being a circle or star, it is a line of text. The brain processes words differently from images, so this can add a new level of depth to fractal flames. Or the text can be a single symbol (not necessarily a letter), using text_wf as a blur with a specialized shape. Text_wf can be quite versatile.