Overview
Most packs that promise a new look repaint the game. Classic 3D does the opposite: it leaves every vanilla texture exactly as it is and rebuilds the shape of the blocks instead.
A stair gains a carved nosing. A wall gains a real post. A door sits inside its frame with a recessed panel and a handle that sticks out. Iron bars stop being a flat cross and become bars you can see around. Because the pixel art is untouched, the world still reads as ordinary Minecraft - it simply catches light along edges that used to be flat.
Reference
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The Classic Error Data Pack