#also isn't it fascinating that a whale took interest in a dreamer and a larper

[blood-orange-juice]

Okay, what the hell. *Puts on a tinfoil hat*

HSR wiki about the faction to which Black Swan belongs to:

To think is to exist, and memories are proofs of that. All things that make up the material world will eventually perish, but they can live on in another way — through Remembrance. Contrary to popular belief that memory is mixed with the imaginary, Memokeepers from the Garden of Recollection believe reality and imagination to be a myth. What is absolutely real and immortal in the universe that is constantly reincarnating? Even stars die and black holes evaporate. On a cosmic scale, they vanish in a breath. In this flood of time and life, the only treasure is the memory that proves the existence of people. Memokeepers from the Garden of Recollection are dedicated to preserving and sharing memories. Enlightened by their master Fuli, Memokeepers shed their mortal flesh and live on as memetic entities. With this unique gift, they can freely traverse between worlds, unconstrained by physical limits. Memokeepers often disguise themselves as natives of the worlds they visit. They trade, copy, steal, deceive... using every means necessary to collect precious memories.

Tears Among the Stars description:

A philosopher in the faraway ancient world once posited that where there is life, there is death; naturally where there is death, there is life. If not, then the fleeting light cannot resist the eternal darkness, and all withers into nothingness at the end of time. The rules among the stars dictate that nature must be conserved, but the laws of the universe have never been conserved. In a sealed box, destruction always overpowers new life. Millennia upon millennia of prosperity are but an instant in a span of billions of years. The greatest of achievements, the proudest accomplishments, in time all will tarnish, decay, dissipate, and ultimately fade into oblivion. Thus there are things floating in among the stars, once adorned with countless prestigious titles from innumerable civilizations, shedding tears for their ordained demise. Their tears stream down, out of desperation, out of hope, because all desperation and hope alike will be utterly extinguished along with the innumerable stars. Their tears stream down out of sorrow, out of joy, because both will eventually scatter into the cold, dark endless void. Every tiny yet beautiful silhouette and every moment worth remembering will fade with time, even stars. And then there are these so-called "gods" that are determined to save everything worth saving, and devour everything that should be devoured. Until the end of time, until the sea of stars recess into nothing but dying embers, until a newborn "world" moves for the first time in the stomach of the whale. "There will be no more sins, no more sadness, and no more tears, because everything died with the ancient stars."

Also a Memokeeper can be zipped into a memory bubble. Does it remind you of something?

And let's not forget March (she follows path of Remembrance too) who is a human-shaped primogem.

And then we have a description of primogems:

A primordial crystalline gem that's beyond the mundane world. Shines with the condensed hopes and dreams of universes that once were.

I REST MY CASE

Teyvat is a bubble universe made from someone's memories. The primordial sea is important because it's the stuff that dreams (and memories) are made of.