The Stoners sold American Radio Systems and its 106 stations to CBS in 1999. That's when the serious work of this collection began. It is one thing to put together the work of 40 sculptors you think best represent the past 100 years. It is quite another to find both the inspirational drawings and the completed sculptures. For the Stoners, it was a kind of scavenger hunt. With the help of Guggenheim and her partner, Abigail Asher, they chased their quarry from estate sales to galleries and back again.

Now that the collection has been essentially completed, they are taking what the couple calls "pilgrimages" to learn as much as they can about the artists in it, reading books, visiting birthplaces, exhibits, galleries, even graves.

Not long ago, for example, they took a helicopter ride so they could walk Robert Smithson's 1,500-foot spiral jetty in the Great Salt Lake in Utah, which had finally emerged from three decades of high water. (They have only the drawing of this piece, just as they own just the color pencil drawing Cristo made of his plan to drape orange fabric across Rifle Gap in Colorado, a mammoth installation called "Valley Curtain.")

With the end of the millennium, the Stoners looked forward. "OK," Tom said, "the 20th century is over. It's behind us. What about now?"

The answer, of course, is the same as it is for movies, books and music. Digital. Digital art.

Bill Viola began working in this discipline about 30 years ago. Also called video art, it is in its infancy, but it has captivated the Stoners with its palpable vitality and, very often, its connection to nature.

One of the first pieces they purchased was Viola's "Becoming Light." Two lovers swim in moonlit waters and are gradually transformed into stars in the heavens over the course of this exquisite video.

In another, titled "Dervish" by Jennifer Steinkamp, another leading video artist, the leaves on a silhouetted tree, dancing like dervishes in a strong wind, gradually change with the seasons.

There is humor in this art form, too. The pixels in an image of the artist's face slide from one screen to the next, but they never completely form the image on either screen. It is titled "Both Here and Here," and the Stoners sought out the artist, Siebren Versteeg, in his Brooklyn studio to meet him and buy the piece.

"We really liked him very much," said Kitty Stoner. "I guess that's a good thing, since that's him in a shelf in my house."

When the Stoners sold their radio company, they created the TKF Foundation in Annapolis, and for 15 years they have been creating gardens in places that need them the most — including a Baltimore street corner where children who died in violence are remembered, and behind the concertina wire of a prison.

The foundation was born from their love of nature and their deep understanding of its healing powers, and this new branch of their art collecting grows from that.

Almost all of the video subjects have one foot in the natural world and the other in the life of the spirit. Sitting on the big wraparound sofa in their darkened screening room, you can feel your blood pressure drop and the furrow in your brow melt away as you watch them. It is a whole new way of experiencing the power of art.

"Art is what we do now," said Kitty Stoner. All their trips, business and pleasure, include visits to galleries and shows, and now to the studios of the video artists they seek out.

They have collected about 24 video pieces — some of which cost as little as a couple thousand dollars — and they are looking for a way to share them with people outside their darkened screening room, perhaps by screening them on the side of a building.

"All art just passes through the hands of people," said Tom Stoner. "We are just temporary owners, trustees in a way. It belongs in the public realm because art is what moves a society forward."

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