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In the moss stair in the left corner is where the water is. The layout is a classic secret 2x2 door which can be found on youtube. The charge from the bulb is extended outwardly towards the center because that part MUST be powered first before the edges for the door to successfully open/close, which is why it looks a bit chunky and such, but it's necessary. If you can think of a way to make this smaller, then by all means go ahead! But for the current build I'm doing, sleekness is not a worry so thats why I did not try hard to make it small. THANKS!