You can (and I do) use the fact that it is a 3D space to store further information (such as ordering and relationship between items). In CS terms, a memory pal

You can (and I do) use the fact that it is a 3D space to store further information (such as ordering and relationship between items). In CS terms, a memory palace is usually used as a linked list while a peg system would be a hash-table but you can turn the memory palace into an array with both O(1) random access and fast in-order iteration.