His old intro from when the show was called The Coding Rainbow had a direct reference to The Joy of Painting, where he appears wearing a Bob Ross perm wig, holding a paint brush and palette in front of an easel

https://youtu.be/_t0ZBAk72K8?t=40

+1, Daniel Shiffman is an absolute treasure. His studio setup is fantastic and him and his team (?) produce incredible videos.

That is exactly who I thought of immediately after reading the previous comment.