The sound is associated with Doraemon, the Japanese manga and anime series centered on the robotic cat Doraemon and his futuristic gadgets. Online, people often refer to it in Spanish as "puerta magica doraemon" when searching for the effect. It spread widely through short meme edits, anime nostalgia clips and simple transition videos because the idea is immediately clear: a magical door that takes you somewhere else. That mix of recognizability and simplicity keeps the sound useful years after viewers first heard it.