If art is among your full-blown obsessions or just a budding interest, Google, which has already altered the collective universe in so many ways, changed your life last week. It unveiled its Art Project, a Web endeavor that offers easy, if not yet seamless, access to some of the art treasures and interiors of 17 museums in the United States and Europe.

It is very much a work in progress, full of bugs and information gaps, and sometimes blurry, careering virtual tours. But it is already a mesmerizing, world-expanding tool for self-education. You can spend hours exploring it, examining paintings from far off and close up, poking around some of the world’s great museums all by your lonesome. I have, and my advice is: Expect mood swings. This adventure is not without frustrations.

On the virtual tour of the Uffizi in Florence the paintings are sometimes little more than framed smudges on the wall. (The Dürer room: don’t go there.) But you can look at Botticelli’s “Birth of Venus” almost inch by inch. It’s nothing like standing before the real, breathing thing. What you see is a very good reproduction that offers the option to pore over the surface with an adjustable magnifying rectangle. This feels like an eerie approximation, at a clinical, digital remove, of the kind of intimacy usually granted only to the artist and his assistants, or conservators and preparators.

There are high-resolution images of more than 1,000 artworks in the Art Project (googleartproject.com) and virtual tours of several hundred galleries and other spaces inside the 17 participating institutions. In addition each museum has selected a single, usually canonical work  like the Botticelli “Venus”  for star treatment. These works have been painstakingly photographed for super-high, mega-pixel resolution. (Although often, to my eye, the high-resolution version seems as good as the mega-pixel one.)