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    copied!<p>The first one is the class' eigenclass. The second one is related to the eigenclass as well, as a method handler:</p> <pre><code>&gt;&gt; def count_classes &gt;&gt; ObjectSpace.count_objects[:T_CLASS] &gt;&gt; end =&gt; nil &gt;&gt; k = count_classes =&gt; 890 &gt;&gt; class A; end =&gt; nil &gt;&gt; puts count_classes - k 2 # eigenclass created here =&gt; nil &gt;&gt; k = count_classes =&gt; 892 &gt;&gt; class A; def self.foo; nil; end; end =&gt; nil &gt;&gt; puts count_classes - k 1 # A/class eigenclass method handler? =&gt; nil &gt;&gt; k = count_classes =&gt; 893 &gt;&gt; class A; def bar; nil; end; end =&gt; nil &gt;&gt; puts count_classes - k 0 # instance method don't count =&gt; nil &gt;&gt; class A; def self.baz; nil; end; end =&gt; nil &gt;&gt; puts count_classes - k 0 # A/eigenclass already has a handler =&gt; nil &gt;&gt; class B &lt; A; end =&gt; nil &gt;&gt; puts count_classes - k 2 # the class and its eigenclass, again =&gt; nil &gt;&gt; class C; end =&gt; nil &gt;&gt; k = count_classes =&gt; 897 &gt;&gt; class C; def foo; end; end =&gt; nil &gt;&gt; puts count_classes - k 0 # so... definitely class method related &gt;&gt; class B; def self.xyz; end; end =&gt; nil &gt;&gt; puts count_classes - k 1 # B/eigenclass handler =&gt; nil &gt;&gt; k = count_classes =&gt; 898 &gt;&gt; a = A.new =&gt; #&lt;A:0x007f810c112350&gt; &gt;&gt; puts count_classes - k 0 =&gt; nil &gt;&gt; def a.zyx; end =&gt; nil &gt;&gt; puts count_classes - k 1 # a/eigenclass handler =&gt; nil </code></pre> <p>I'm not familiar enough with ruby internals to know for sure, but that would be my best guess.</p>
 

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