BOSTON — Now you see them; now you don’t. Pop-up storefronts and eateries have been around for years, but entrepreneurs increasingly are taking the concept in new and unexpected directions.

Last week, New York welcomed the Museum of Ice Cream, an interactive pop-up honoring the frozen treat.

In Chicago, a short-term diner this month replicates “The Max,” the fictitious Southern California hangout from the 1990s-era high school sitcom “Saved by the Bell.”

And in London last month, patrons dined at The Bunyadi, a quick-hit naked restaurant where clothing was optional and cellphones were banned. One may surface in Paris next month.

In some ways, the idea of a pop-up has always been around, from seasonal stores selling Halloween costumes to produce stands and pushcart vendors.

But the more recent versions of pop-ups took form around the 2008 recession, says Glenn Sulmasy, provost at Bryant University in Smithfield, Rhode Island.

Shopping malls and commercial landlords were looking to fill vacant storefronts, small business owners needed low-cost ways to build their brands and a younger generation of customers was looking for something different than retail chain stores.

Sulmasy says London was among the first cities to proactively encourage pop-ups during the recession.

Today, pop-ups aren’t just the preserve of clothing, jewelry and other typical retailers.

Jeremy Baras, CEO of PopUp Republic, a Chicago-based consultancy firm, estimates there are at least 3,000 to 4,000 pop-ups happening at any given time in the U.S.

In Boston alone this summer, there’s been a pop-up beach, bike lane, track and field competition, beer garden and yoga classes.

Baras says newer examples are increasingly focused on generating buzz and incorporating emerging digital technology such as virtual reality headsets to create memorable and immersive experiences.

“It’s about unique and innovative concepts that can create exclusivity and drive traffic and attention,” Baras says.

For many entrepreneurs, the goal of a pop-up remains demonstrating that a concept works, then scaling up.

Some pop-up entrepreneurs don’t have an interest in setting down roots.

PlaceInvaders, a New York-based company, does intimate dinners in unique homes all across the country while the property owners are away.

Since launching in 2014, they’ve hosted meals in Motown Records founder Berry Gordy’s former mansion in Detroit; a historic firehouse in Phoenix, Arizona; and a graffiti studio in New York, among dozens of places.

“Our end game isn’t a single, standalone location,” says co-founder Katie Smith-Adair. “We started the company because we wanted to be traveling, living in new cities and meeting new people.”

Policymakers see value in pop-ups to revitalize old commercial centers and encourage local startups.

Cincinnati; San Antonio; Tacoma, Washington; and Pittsburgh are providing low cost rents, marketing and other support to pop-ups while also trying to streamline small business permitting and licensing processes, says Emily Robbins, of the National League of Cities in Washington, D.C.

Other cities are also trying out pop-up “parklets” – temporary seating nooks carved out of parking spaces – and encouraging other non-commercial pop-ups such as exercise groups and art exhibitions.

“Cities really want this type of activity, so they’re going to figure out ways they can support that growth,” she says.

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