Sounds emanate from beyond the barrier. Strange, unfamiliar, frightening. Over time, you grow curious. You bore a little hole through the wall, and peek.
What you see excites the senses. You realize you've been complacent, sealing yourself away from something beautiful. You widen the gap, maximize your view.
As the hole grows, the wall above weakens. Collapse seems imminent and could crush you underneath, rendering the wonders on the other side unreachable. Do you allow it to crumble, or push into this new world? You make a choice.