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The ghost cell pattern is a technique used to allow threads in a particular block to access data that would normally be inside another block.
We make a shared memory array larger than the number of threads per block in a particular dimension, then when we are at the first or last thread,
can copy a neighbouring cells' data based on a global index, to our local ghost cell.
The following info and images are taken from: http://people.csail.mit.edu/fred/ghost_cell.pdf
