(Seriously, let's use the proper terminology!)
Prototype-based is what you are called object-based and Wikipedia says,
"Prototype-based programming is a style of object-oriented programming in which *classes are not present*, and behavior reuse (known as inheritance in class-based languages) is performed via a process of cloning existing objects that serve as prototypes. This model can also be known as class-less, prototype-oriented or instance-based programming."
Wikipedia: Prototype-based programming - http://en.wikipedia.org/wiki/Prototype-based_programming