How can shapes change the overall mood of an artwork?

A(n) __ clause should always be separated from the rest of the sentence by commas

Read these sentences from thr excerpt. what the most dreaded, that i most desired. what he most loved, i most hated. that which to him was a great evil, to be carefully shunned, was to me a great good, to be diligently sought; and the argument which he so warmly urged, against my learning to read, only served to inspire me with a desire and determination to learn. which statement best explains why the author uses parallel structure to advance his purpose?

Besides the skull and cross bones what other shape sometimes appeared on flags flown by pirates?