How is Crooks's room important to theme in Of Mice and Men?John Steinbeck's Of Mice and Men

In addition to the cogent points made: While the situation
of Crooks's having to live in the barn indicates the racial divide and his intense
isolation, the conversation that ensues indicates that Crooks is not so different at
all. 

At first, Crooks is defensive when Lennie enters, and
out of his vulnerability his strength to oppress Lennie comes; he attempts to hurt
Lennie. But, when Lennie poses no threat for Crooks, he begins to confide in
him:

"A guy
can talk to you an' be sure you won't go blabbin'....I seen it over an' over--a guy
talkin' to another guy and it don't make no difference if he don't hear or understand. 
The thing is, they're talkin', or they're settin' still not talkin'.  It don't make no
difference, no difference."  His excitement had increased until he pounded his knee with
his hand.

This passage is
significant because it illustrates the commonality of all men in their existential need
for sharing, for someone to help them measure the world.  Although set apart racially,
Crooks's human needs are identical to those of the other men; his words mirror those of
George when he has spoken to Slim in a previous passage about the importance of having a
friend. When he is provided the opportunity to be in communion with others, Crooks
becomes excited and happy as he feels that he has found more of a place in nature, a
common need for all men.