. >> up next on booktv, kenneth brower talks about his father, sierra club founder david brower. the wilderness within is a collection of interviews kenneth brower did with well known environmentalists who were influenced by his father. this is just over an hour. [applause] >> amy, you forgot to mention that wonderful sculpture out there. >> oh, yeah, it's great. >> my son rubin made that sculpture that's hanging there. [applause] well, it was a lot of fun working with you on this as a publisher, and as they say in another area of life, was it as good for you as it was for me? [laughter] >> it wasn't, no. [laughter] we've been talking about it for a long time. we finally did it. >> we finally did it. and you seem to have done it with such joy. i mean, and such humor and playfulness. usually when it comes to environmental literature, when it comes to the problems of the world, a grimness to it often. but yours is just so -- it sounds like you really had fun doing it. >> well, thank you, and i did. and t one of the things i -- it's one of the things i must have learned from my fath