To the extent that consciousness is useful, it is useful in small quantities, and for very particular kinds of tasks. It's easy to understand why you would not want to be consciously aware of the intricacies of your muscle movement, but this can be less intuitive when applied to your perceptions, thoughts, and beliefs, which are also final products of the activity of billions of nerve cells.
The days of thinking of time as a river—evenly flowing, always advancing—are over. Time perception, just like vision, is a construction of the brain.
Sum on Radiolab
Listen to David discussing Sum -- and actor Jeffrey Tambor reading stories from the book -- on WNYC's Radiolab.
Eagleman and Brian Eno bring Sum to Sydney Opera House
In June, 2009, David Eagleman collaborated with musician/producer Brian Eno to perform a musical reading of Sum to 1,000 people at the Sydney Opera House. In May of 2010 they performed together again to 1,200 people at the Brighton Dome in England. Stay tuned for further performances.