The butterflies on this page could all be lumped into a category labeled non-existent, or missing, non-included, undisplayed, invisible, nowhere to found, etc.
The correct answer is "personal topics such as love and loss" and "the cyclic feel that the stanza structure produces."
The other answer is WRONG.
Conjectured:
another way would be to read it as: "dr. olivae came to the conclusion that a robot..."