How to create a hidden chest you can check out the guide!
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When you create a room you may always be afraid of someone taking your items and now comes a guild of hidden chest.
First you can prepare the most important thing as exhibition frame then spinning block and put the spinning block like this and put a random block on it.
Then put frames on each side of the block:
Put what you want to hide in the frame like this:
Dig down to the bottom of the spinning block and put a electric source under it.
When the spinning chest is activated your item will be hidden.