Can anybody less stupid than me translate what went on in this chapter? I feel like a pet dog watching a married couple on the brink of divorce, not quite getting what they're saying, but knowing the atmosphere is wrong.
while i'm probably stupider, i think it helps to split the thoughts and the dialogue into two different streams. personally i had to read the chapter twice.
the thoughts are mostly him thinking about how the photographs of his sisters show them through various stages of their growth, and how he has difficulty thinking of the person in the photograph as the physical person in front of him.
it relates it to his artwork, using metaphors for birth and the growth of humans themselves. just like how a person grows from an embryo, into a fully realised human being, the same way his art grew and became more detailed and defined.
this happens rapidly (probably commenting on the nature of time) and in a way it represents how fast time itself is.
in the dialogue itself, they're talking about how things which may seem new to someone, may seem to old to someone else. it's a bit about duality. the same way his sister(?) may 'discover' a restaurant which he has known about for a long time, his sister(?) used to have no money but had free time, and now has money but no free time.
this is mixed with dialogue about how it's good that he's fat since she can use him to sample dishes (with the idea that if she doesn't like something, he'll finish it) since she's picky about what she likes. also talks about how you need to try various things to expand your palette.
that last point i'm guessing is being linked to his association with the FMC, with doing artwork of her being a way for him to expand his palette in terms of art experiences.
in general it's got main themes of time, improving one's skills through experiences, growth and duality of life itself.
of course, this may all be a giant pile of shit which i hallucinated.
big credit to the translators if i'm accurate.