A secret world.

    By Whitesunshine87
    “Everybody has a secret world inside of them. I mean everybody. All of the people in the whole world, I mean everybody — no matter how dull and boring they are on the outside. Inside them they've all got unimaginable, magnificent, wonderful, stupid, amazing worlds... Not just one world. Hundreds of them. Thousands, maybe.” 
    ? Neil Gaiman, The Sandman book 5 A Game of You.