The fact that a number of explorers knew that California was not an island was not enough to nip the idea in the bud. Yet it would be a shame to think of the idea as simply an error, a cartographical crease which needed ironing out. Even though maps may be presented as accurate, they cannot escape their metaphorical nature. They reflect much more than physical geography. That California was mapped as an island for so long speaks to its separateness. The writer Rebecca Solnit, a student of the Stanford maps, has argued that, “An island is anything surrounded by difference.” The state contains around 2,000 plant species found nowhere else. Its borders comprise dizzying mountains, harsh deserts and immense ocean. It has been home to the Gold Rush, the psychedelic era, the silicon boom. In several ways then, California is an island.