2 Improved formatting and phrasing
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He likely referenced this book: https://www.goodreads.com/book/show/4379959-sort-it-outSort It Out!

Sort It Out! by Barbara Mariconda, Sherry Rogers (Illustrator) Packy

Packy the Packrat's mother has had enough! It's time that he sorts through his ever ever-growing collection of trinkets and puts them away. Told in rhyme, the the text leads the reader to participate in the sorting process by categorizing categorizing Packy's piles of things according to like characteristics and and attributes. The story promotes and reinforces analogous thinking thinking--a critical thinking skill in math, science, and life. In the    -For Creative Minds- education section at the back of the book, the reader can explore even more attributes and characteristics of objects objects, including color, size, texture, shape, and material.

Or possibly this oneMouse Paint by Ellen Stoll Walsh from 1995, because authors of Rick and Morty are of the appropriate age to have been read the book with similar theme: Mouse Paint Board book – October 31, 1995 by Ellen Stoll Walsh (Author)it.

He referenced this book: https://www.goodreads.com/book/show/4379959-sort-it-out

Sort It Out! by Barbara Mariconda, Sherry Rogers (Illustrator) Packy the Packrat's mother has had enough! It's time that he sorts through his ever-growing collection of trinkets and puts them away. Told in rhyme, the text leads the reader to participate in the sorting process by categorizing Packy's piles of things according to like characteristics and attributes. The story promotes and reinforces analogous thinking--a critical thinking skill in math, science, and life. In the  -For Creative Minds- education section at the back of the book, the reader can explore even more attributes and characteristics of objects, including color, size, texture, shape, and material.

Or possibly this one, because authors of Rick and Morty are appropriate age to have been read the book with similar theme: Mouse Paint Board book – October 31, 1995 by Ellen Stoll Walsh (Author)

He likely referenced Sort It Out!

Sort It Out! by Barbara Mariconda, Sherry Rogers (Illustrator)

Packy the Packrat's mother has had enough! It's time that he sorts through his ever-growing collection of trinkets and puts them away. Told in rhyme, the text leads the reader to participate in the sorting process by categorizing Packy's piles of things according to like characteristics and attributes. The story promotes and reinforces analogous thinking--a critical thinking skill in math, science, and life. In the  -For Creative Minds- education section at the back of the book, the reader can explore even more attributes and characteristics of objects, including color, size, texture, shape, and material.

Or possibly Mouse Paint by Ellen Stoll Walsh from 1995, because authors of Rick and Morty are of the appropriate age to have been read it.

1
source | link

He referenced this book: https://www.goodreads.com/book/show/4379959-sort-it-out

Sort It Out! by Barbara Mariconda, Sherry Rogers (Illustrator) Packy the Packrat's mother has had enough! It's time that he sorts through his ever-growing collection of trinkets and puts them away. Told in rhyme, the text leads the reader to participate in the sorting process by categorizing Packy's piles of things according to like characteristics and attributes. The story promotes and reinforces analogous thinking--a critical thinking skill in math, science, and life. In the -For Creative Minds- education section at the back of the book, the reader can explore even more attributes and characteristics of objects, including color, size, texture, shape, and material.

Or possibly this one, because authors of Rick and Morty are appropriate age to have been read the book with similar theme: Mouse Paint Board book – October 31, 1995 by Ellen Stoll Walsh (Author)