They are alike because they both have 2 syllables and have the letter ''r'' in them.
Pagodas built during the Song Dynasty were heavily influences by Buddhist structures. Or the Buddhist pagodas themselves.
A geode is a round hollow rock lines with crystals.
Their hearts have not grown old;
Passion or conquest, wander where they will,
Attend upon them still. I would say that this section of the poem indicate that the swans represent eternity ie saying that their hearts have not grown old and that they still have passion and a will for conquest indicates at least for now eternal qualities that they possess,
