Minecraft has a lot of blocks, but what if they had more? Why do we need them? Please don't just add lists of things - these will be marked as spam and removed! Also, no furniture, guns, or vertical/"sideways"/"upright"/"standing" slabs (yes, we see you).

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Necker Cube block

It's a cube that's always tangled up with itself, no matter your perspective on it. Given that the GPU can simply receive reverse instructions for certain 2D overlaps of a (computationally) 3D object, it could be anywhere in terms of how hard it would be to code, but if easy to implement, it would be fairly unique in the gaming world. The bigger challenge would be to have multiple Necker cubes interact when placed adjacent to each other! (Maybe too much.) Should be a transparent block for maximum visual effect. 

I'm thinking that crafting it from weathered copper blocks might be an interesting approach. 

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    I think this would be interesting, but I'm not sure if it's possible.  We all know about impossible objects like the Penrose Triangle (AKA impossible triangle), but it seems to me like every impossible object has to have at least one viewpoint that just couldn't exist.  For example, if you tried to draw a picture of the impossible triangle, looking at it from underneath, you'd have trouble because one leg sticks one way and the other leg sticks the other way and they'd still have to join together, etc.  You can draw an impossible triangle from some viewpoint by messing with perspective, but it seems like for other viewpoints it is, as the name suggests, impossible.  I'm wondering if a similar situation would come about here.  Perhaps if the player looked at a Necker Cube from a certain point of view, there would be no way to render it.  But if this is possible I would definitely like to see it in the game.