A massive door with opening animation which I created for some of my old [Blender Game Engine](https://en.wikipedia.org/wiki/Blender_Game_Engine) experiments (2011).
* https://www.youtube.com/watch?v=iVx7DWBU34A
* https://www.youtube.com/watch?v=wTB1sXVRtvk
* https://www.youtube.com/watch?v=JjOA38Ey8tg
* https://www.youtube.com/watch?v=_90FL54rLdI
* https://www.youtube.com/watch?v=5QX3iIYyvyo