Although Acquavella will have a viewing room in the online fair, this high-end gallery has been slow to get on the digital train. “We’ve definitely thought about it, but we have not taken the necessary steps to do it properly,” said Nick Acquavella, a partner. “We don’t want to close our minds to something new that could be potentially beneficial, but we also don’t have to be the tip of the spear.”

Artists might be expected to be less than enthusiastic about having their work purchased the way one would a sweater or shoes (though you can’t click and buy yet; those interested have to contact the gallery through email). But several said they are intrigued by this new frontier.

“They feel personal, they feel intimate,” said the artist Jeff Koons of online viewing rooms. “I love looking at images. I can be just as happy to look at an image of a Manet painting online. It’s really about the stimulation that a work has for you.

“Of course it’s great to see the original, but sometimes the lighting may not be as nice,” he added. “There are always pros and cons to everything, but the positive aspect of having these platforms is that it’s good for the dialogue of art.”

Pace, which first launched online viewing rooms privately last year, began offering them to the public on Monday, starting with one on the artist Sam Gilliam. The gallery will continue with a series of thematic online presentations — including others on ceramics and photographic artists — during its temporary closure.

Mr. Zwirner has presented 50 viewing rooms in the last three years, and says that online sales increased 400 percent in just the last year. The gallery’s viewing room for Art Basel Hong Kong — its largest to date, with a total value of more than $16 million — will debut a new work by Mr. Koons, along with art by Noah Davis, Marlene Dumas, Kerry James Marshall and Alice Neel.