From The New Yorker, Dec. 28, 2020. 

"Hot-Ice-Cream Dreams" by Adam Gopnik (not usually my favorite) --a review of Wild Minds: The Artists and Rivalries That Inspired the Golden Age of Animation  by Reit Mitenbuler. As always with Gopnik, more of an essay than a review.

The closing paragraph gets at something that fascinates me, and that in my own way I´m working through with my book--the fluidity of art/expressive forms, the passage of core "nuclei" from one to another according to the macrostructural conditions

82--"The good stuff [in animation] never disappears, but it does subside. We are living throuh a moment of subsidence now. Flexibility of form meets the certainties of commerce. Dammed up, the flow of creative energy retreats, re-forms, finds a new opening, and starts to flow again...All art aspires to the condition of music, a wise man said once, and perhaps all cultural history aspires to the condition of a cartoon: a seeming fluidity of movement, made up of countless small stops and starts."