This was my third read through of Blindsight. It remains consistently challenging, thought provoking and engaging. I was still finding nuances I had missed on previous read throughs and it just flowed like any good read should. The central premise that sentience is not all its cracked up to be remains controversial. Watts really threw everything and the kitchen sink into this one and while it doesn't all work, it does all fit. Rarely does a novel have me scurrying to Wikipedia so often to verify my understanding of a concept. This book talks about cognition, empathy, first contact, aliens within and without and throws in a dash of speculation as to where our society might go. Probably not to everyone's taste but it is one of those books that grabs me by the balls and won't let go. It can be downloaded for free too, officially!