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Can you build it so it's possible to make shapes with it? Like, is there some kind of block that doesn't get absorbed by the lava? That way you could build a big smiley in there or whatever.
The only blocks I've seen lava burn through is stairs and wood, and only because it sets the wood slowly on fire. The difficulty there would be getting the lava to flow inside the smiley. You'd probably have to build it floating in midair in front of the lava screen, making the lava back light it.