Lucid Chair There are a wide variety of styles and options in the Lucid Series allowing the designer or end user to select the correct combination of function, as well as, aesthetic appeal. The back is a molded shell of polypropylene that offers a thin, contoured profile. It is available as a high, mid or task back. As an added feature, there is an onboard tool that allows you to remove the high back and turn it around in the field to creat a mid back, or visa versa. This gives the user more flexibility and is advantageous for standard programs.