3D Model: Create A Hollow Tunnel Open On Both Ends. Only Model The Entrance Frame And The Tunnel Interior — Do Not Include Any Surrounding Walls Or Environment. The Entrance Frame Should Be Made From LEGO-style Bricks With Bright, Cartoony Colors. The Interior Should Be Slightly Darker, Using Muted LEGO-like Bricks Such As Greys. Keep It Playful And Toy-like, Suitable For A Small-scale Toy Scene.