The world in the palm of my hand
You have a small space to carry around. The outside world is stormy, the iron horse glacier, and the zombies are like a tide, you can rest and play and eat hot pot inside.
The outside world is secretive, deceitful, and bullets are raining, you can hide inside and shoot cold guns. When others are short of food and clothing, you have already gathered all the talents to open a factory in your personal space.
What's even more wonderful is that this small space expands exponentially as you shuttle from world to world, seizing the origin of ten thousand worlds, and finally becoming a real world.