The theme of wearing masks, particularly Iago, is at play here. Iago relishes in his powers of duplicity and manipulation which enables him to cause chaos and ruin Othello,
I follow but myself.Heaven is my judge, not I for love and duty,But seeming so, for my peculiar end.For when my outward action doth demonstrateThe native act and figure of my heart65In compliment extern, ’tis not long afterBut I will wear my heart upon my sleeveFor daws to peck at. I am not what I am.