Ancient Greek mythical literature contained a substantial element of fiction and made reference to gods, heroes and rituals of the time. Similarly, contemporary literature directs attentions to science fiction, as well as superhuman and courageous characters, like Harry Potter.
Its hard to read a passage without taking short breaks. Punctuation gives us the break to end or start a sentence in a fluent matter. As well as having the passage without punctuation gives readers a hard time to what is happening.