This talk is about how you can use specification by example to write bottom-up TDD. I use TDD as if you meant it as the extreme classicist TDD aproach for showing how you can grow your systems bottom-up.
See here the flipchart pictures from during the presentation:
See here the codebase: https://github.com/adi-bolb/FoldingTheSoftwareDesignSpace/commits/01-bottom-up-specification-by-example?page=2
Picture from during the session: https://www.flickr.com/photos/sebastian_bergmann/14684033197/in/set-72157646302093521