WANDERING EARTH - Reactor Lighter

What if Earth itself was the spaceship to save humanity?
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In order to restart the faulty reactor, the heroes need to bring the lighter to the reactor core. Shown first in a cubic casing, the core is actual a sphere of incredible power (No idea what it is really). As an inspiration, we referenced old Chinese puzzles, little pieces of wood assembled to make a sphere.
My main idea for the reveal of the sphere was like opening the belly of a beast and pulling out the guts of it, which explains the mess of wires and tubes when you pull out the lighter.