Presented with a great shape like that, obviously the first thing you do is to rummage around to find the large piece of foam that you've been saving for just such an occasion. Ah, there it is. Ok great, so you use that to add some pieces up on the top.  
Then in preparation for the next obvious step, you gouge out a pair of narrow but deep slits in the sides of the large block, just as anyone would do. Anyone who can see that which cries out to be done.

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