What are all the items on the cover of the "Linux Administration Handbook"?

As I mentioned in https://unix.stackexchange.com/questions/26045/ I'm fairly new to Linux and Unix. @jasonwryan provided an excellent link to a blog that describes all of the items on the front of the first book, but is there an explanation available for all the items on the cover of the the "Linux Administration Handbook"? I didn't see any other entries on Lisa Hanley's blog. 0. Cloud 0. Penguin Skiing 0. VISTA Helicopter 0. Tombstone 0. Coffin 0. Book 0. Dead Cat 0. Boy in a cube 0. Monkey on a vine 0. Tire 0. Restrained Spider 0. Cliff 0. Spock 0. Hand 0. Doctor 0. Tunnel