That's an interesting question. Please allow me to avoid answering it by asking a question of my own: Is this really an "island"? In the geographic sense of that word, an "island" is a plot of land surrounded by water, such that you could circumnavigate the land in a boat and never leave the body of water. In a similar sense, does a kitchen "island" need to be completely surrounded by the kitchen's floor, such that you could walk around the thing and never leave the kitchen? More to the point, does this concept I have described alter the answer to the OP's question?