The simplicity of the Objective-C runtime is one of it's most impressive features. There are very few rules to the object system, and meta classes are an exampl

The simplicity of the Objective-C runtime is one of it's most impressive features. There are very few rules to the object system, and meta classes are an example of how flexible that is. Combine that with the fact that the language is entirely implemented in C as functions operating under those rules, and you've got an excellent foundation.