Amonologue delivered by an actor alone on the stage is 1.a soliloquy 2.an aside 3.a dialogue 4.a catharsis 5.a chorus 6.a prologue

1.a soliloquy

Explanation:

    Soliloquy is a technique often used in theatrical stages or novels. Term of Latin origin, it has the sense of "speaking alone". While in the monologue the character addresses the viewer or reader, in this art the enunciator dialogues with himself or his soul, with the difference that he does not summarize his thoughts to the plane of his consciousness, as in the inner monologue, but enunciates them in voice. high in front of others, although I ignore their presence.

relief sculpture - images are set against a flat background.

a coin is a good example: the inscription, the date, and the figure are slightly raised above a flat surface. the ancient egyptians sometimes carved figures into a flat surface.  

pro: they take significantly less time to make and do not require as much tools or skills as free-standing

cons: not nearly as realistic, as it is not fully 3-d, and does not have the details that a free-standing one does.

freestanding sculptures (also called  carved in the round) are not attached to any  background.   they are 3-dimensional  and fully rendered.