An alien appeared & didn't 'see' the way we see but saw in ways we can't & couldn't imagine, he saw creatures blindly masticating forms of themselves as images & others, without comprehending the immortal mulch they made burying them.
He returned to his world & reported the creatures were with intuition instinctively building their own tomb & steadily filling it; soon the race would be extinct & nature would return to form.
It didn't take long.
mas·ti·cate masticate/ˈmastəˌkāt/verb: masticate; 3rd person present: masticates; past tense: masticated; past participle: masticated; gerund or present participle: masticating chew (food). chew, munch, champ, chomp, crunch, eat; ruminate, chew the cud; technical manducate, triturate; rare chumble Origin mid 17th century (earlier (Middle English) as mastication ): from late Latin masticat- ‘chewed’, from the verb masticare, from Greek mastikhan ‘gnash the teeth’ (related to masasthai ‘to chew’).