Class as first-class object

Question

Could a class be a first-class object? If yes, how would the syntax for dynamically creating new classes look like?

---

To narrow the question - how would you give this functionality while keeping language consistent?

For example how you create reference for new type. Do you make reference first-class object too and then use something like this:

Reference<newType> r = new Reference<newType>();
r.set(value);

Well this could get messy so you may just force user to use Object type references for dynamically created classes, but then you loose type-checking.

I think creating concise syntax for this is interesting problem which solving could lead to better language design, maybe language which is metalanguage for itself (I wonder if this is possible).