I need to compare the nucleolus of a cell to something in real life..?

Can you think of anything to comapre it with?

like what I said for Cell Membrane was: just like a ticket checker at the airport, the cell membrane regulates what goes in and out of the cell.

thanks so much I need answers really bad this is due tomorrow. =D
Update: Also, I'll need to compare ribosomes to something in real life too, so that would help if you know either of those =)
Update 2: Oh and I meant nucleolus, not the nucleus, which IS like the brain. =) thanks though.
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