Thus, subjective tests such as the commutation test have been developed to map connotations and so decode more of the addresser's intentions. This is achieved by changing the form of the signifiers, by substituting signifiers to assess what the alternative connotations would be and by considering what signifiers are absent and why their absences might be significant. Changes of form would require substituting different fonts for the same text, or different colours or designs for the same visual content.