Ever since the Walt Disney Pictures logo debuted before The Black Cauldron in 1985, Disney has been tweaking and re-styling and creating multiple variations of the iconic magic castle logo that pops up right before its movies. For a while it's a simple 2D logo stamped on a blue background but eventually it turned 3D with fireworks and a whole mess of effects.
Ethan Jones put together all the different variations of the Walt Disney Pictures logo in the video below. It's interesting to see how complicated it has become. The version of the logo that was seen before Tron: Legacy is a particularly fun one:
Here's the first logo: