The 'Tumblr Color Theory Children's Hospital Post' is a legendary piece of internet history originating from a 2019 thread. It began when a user shared a photo of a children's hospital floor featuring smeared red paint trails, arguing that from a 'color theory' perspective, red is associated with life and vitality, making it a positive choice. However, the rest of the internet immediately pointed out the obvious: in a hospital setting, long red streaks look like a trail of blood from a horror movie. The meme has since become a shorthand for any situation where someone uses high-level academic or artistic theory to justify a visually disastrous or tone-deaf result. It perfectly captures the hilariously wide gap between intellectual intent and practical reality.