The poem explores the idea of dreaming and the road to infinity. The phrase "passively dream, without remorse" suggests a passive, yet dreamlike state, where there are no regrets or worries. The road to infinity is described as breathing fresh rules. As one travels further, a person constantly encounters new experiences and perspectives.
The "tower of ivory" and "house of gold" symbolize representations of wealth, power, and grace. "Phantoms of grace" refer to the fleeting nature of these things, and how they are difficult to hold onto. The line "push on, selah" is a call to action, to keep moving forward, even though these ideals are difficult to grasp.
The person in the poem is held up in a reading room, with a throne established from old. The catacombs of input with no output suggest a state of being that passively receives information, without acting upon said information. He is the first or last person in creation, which alludes to the idea that he is either at the beginning or end of a journey. An infinite loop.
The final lines describe the person following the speaker into oblivion, with the invitation being for a ride of a lifetime. The slow beat of the it refers to the pace of this journey, which is deliberate and steady.
It’s an exploration of the idea of dreaming, the journey towards enlightenment (or something similar to it), and the fleeting nature of wealth, power, and grace. The speaker is inviting the person to join them on this journey, despite the challenges they may face.