This is one book that will always have a home on my shelf.
A massive book in size and weight, Infinite Worlds is not only a fascinating collection of science fiction art from the 20th century but also an informative historical work as well.
After the forward by Ray Bradbury, the book is split into two parts. The first 1/3 covers the history of science fiction in general alongside the evolution of the art that was commissioned throughout the decades for books, magazines, and film. The way this third of the book is structured is the only reason I've knocked a star off my final rating. In summary, I feel this part of the book was written with the intention of it being read from start to finish like a novel. However, this isn't a novel. Sadly, there is no easy way to tell which era of science fiction you are reading about unless you get into the individual paragraphs on the pages - there are no headers or sub-headers to break apart this section at all. On a related note, the Table of Contents also reflects this, but for the book as a whole - it's very minimalist in its presentation, making it harder than it should be to find what you are looking for. Yes, there is an index page, but it only lists artists. If you are looking to understand specific eras of science fiction and its artwork, expect to search page by page for your content.
With that out of the way, I must state that the history, in terms of its raw content, is very informative and inspirational.
This takes us to the last 2/3 of the book - the meat of the book, as it were. Sorted by last name order, over two hundred artists and their select works are presented to you with incredible artistic detail. In some cases there are full-page spreads while in others the artists' work is presented as it was as part of magazine or book covers. It's truly fascinating to me to see such an amazing combination of hand-drawn art alongside the beginnings of digital art - and then to learn all about the artists who created them. Most artists receive two solid paragraphs describing who they are and their contributions to the science fiction world, but a handful definitely got more press than others. That said, I don't feel that detracts from the overall quality that these pictures are presented.
My one gripe here is that in many cases, the artwork that is presented may have the artist's name and the publisher, but details on the written work in which the art was used is omitted. If you want to read the work in which a certain picture is presented, the odds are that you won't be able to find it unless you scan the image into your computer and run an image search based on that scan. Or look up the artist online and hope their portfolio is publicly available.
Finally - and this is minor in my eyes - this book was published in 1997, over twenty years ago. Obviously there are MANY new artists on the scene that are leaving their marks in the science fiction world, but due to the printed format of this book they aren't represented. Therefore, Infinite Worlds today is best viewed as a history book first since what used to be contemporary artists in it are no longer that in all likelihood.
If you want to gain a greater appreciation of the science fiction genre and its art - where it originated, how it evolved over time - Infinite Worlds is an excellent book to have on your shelf.