When Maryellis Bunn was a child, she dreamed of jumping into a swimming pool full of sprinkles. So, here we are.

On Friday, the 24-year-old Manhattanite threw open the doors to a spectacle worthy of the finest Instagram filter: a Museum of Ice Cream.

The project, which arrives just as New Yorkers are recovering from a heat wave, will run until Aug. 31 in the shadow of the Whitney Museum of American Art in a strip of empty retail spaces in the meatpacking district. Apparently, many other New Yorkers also share her dream: The 30,000 tickets sold out in five days.

Ms. Bunn, who is a creative strategist with clients that include Facebook and Instagram, and Manish Vora — her boyfriend and a museum co-creator — understand their target audience: millennials who need to prove to the rest of social media that they were out somewhere doing something really fun.