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Message: [QUOTE="Logan Capaldo, post: 4503436"] Classes are objects too. @strange is an instance variable of the object A (which has class, Class). @@strange is a class variable of the class A. The difference is that instances of A can peek at the class vars. They can't peek at A's instance vars. They are in two separate namespaces. The other difference is that class variables aren't so much class variables as they are class hiearchy vars. EG: class A @@strange = 1 end class B < A puts @@strange end #prints 1 class C @strange = 1 end class D < C puts @strange end # prints nil [/QUOTE]