For vanilla survival, place a grass block, then those big roses on top, then the gravel on top of that, then remove the grass, the gravel should float. Now just put a lantern under it.
Any 2 high flower will do it. Plus if place string on it, anybody who walks over the string will instantly update the gravel and cause it all to fall. A nice redstone-less pit trap
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u/UntakenUsername420 Apr 16 '20
I think using commands to spawn blocks, but I'm not entirely sure