* [The Mystery of the Tower Revealed: A Non-Reflective Description of the Reflective Tower](http://www.cs.indiana.edu/cgi-bin/techreports/TRNNN.cgi?trnu...) [abstract](http://www.ccs.neu.edu/home/wand/Bibliography.html#WandFried...)
* [Reflection](http://library.readscheme.org/page11.html)
Maybe abstraction is only a means to [expressiveness](http://programmers.stackexchange.com/a/254867/100375).