Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Blending the "here", "there" and "everywhere".

What an interesting and thought provoking book this one turned out to be! With its blending of the past and present, philosophy, action and adventure, science fiction and literature...it covers most of the bases. Unique in both its premise and its delivery, "Portals in a Northern Sky" takes you on a journey, one both physical and mental and gives you cause to think about your relationship with everything. Were it not for a number of editing errors and omissions, I would give this one 5 stars...no question about it; however, as it stands, I give it 4 1/2. I suggest you offer your mind and psyche something a little different as a change in your normal reading habits, and this incredible book will certainly fill that bill.