"This switch from dynamics to statics was the beginning of the end for capturing dynamic behavior" -- T. Reenskaug #readingToday  

Somewhere along the line, statically typed languages got the upper hand, supported by software engineering. One important aspect of static type system analysis was the class: a construct that allowed the compiler to generate efficient code for method lookup and polymorphism. Even Smalltalk, whose initial vision of objects and a dynamic run-time environment was truly visionary, fell victim to the class compromise. The class became the implementation tool for the analysis concept called an object. This switch from dynamics to statics was the beginning of the end for capturing dynamic behavior.