Seconded. I actually discovered Io specifically due to the prototypes vs. classes issue. After running into the limits of class based design while working on

Seconded. I actually discovered Io specifically due to the prototypes vs. classes issue. After running into the limits of class based design while working on a moderately large codebase for a commercial program, I began to question what it would mean, philosophically, for a language to have objects but no inheritance (and by extension no classes), and that led me to finding Io.