[Alexandervn]

Does anyone have a clue of what he is building right now? What are the pyramids?

[cdawzrd]

I assume he's building a level editor. The "pyramids" are building-blocks to create stuff with.

[cookingrobot]

Minecraft didn't have levels and the entire game was essentially a level editor - so this might be the actual game. Moving and reshaping objects instead of smashing and placing blocks.