last from the bunch that was together in pixiv

is there any reason all of these are parented together

The top star, "Arega", doesn't exist. It's a meme based on mishearing the lyrics to Bakemonogatari's ending theme. The other three are the Summer Triangle: Deneb, Altair, and Vega.

Gollgagh said:

is there any reason all of these are parented together

the artist post them together in pixiv, just click source
as far as I understood they were a bunch of old paintings he found, so he post them all in one go

Borrator said:

the artist post them together in pixiv, just click source
as far as I understood they were a bunch of old paintings he found, so he post them all in one go

Incorrect usage of parenting; see help:parent-child for more.