A friend made an april fools video with this but hear me out.
Compressed Blocks. you could make such cool stuff with this redstone mechanic. If you point two pistons at each other at a maximum of fourteen blocks across and you fill the space between them with any kind of movable block, leaving a block for the pistons to extend, if you extend both pistons at the same time, the blocks in the middle become a solid color and become unbreakable and immovable. as soon as the current to the pistons is cut, the pistons come back and the blocks revert to their normal form.
My explanation is pretty bad so just go see his video instead:
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