The only thing that would make these secret room bookcases cooler is if you activate them by pulling out a special, secret book :)
All scenes that take place within the Matrix have a green tint, as if watching them through a computer monitor, while scenes in the real world have normal coloring. The fight scene between Morpheus and Neo, which is neither in the real world nor in the Matrix, is tinted yellow.
Sweet and Spicy Caramelized Onion & BBQ Grilled Cheese
I think the genius part about The Sandman, is that half the stories are almost never about The Sandman, until he shows up at the very end to fix everything.