With the recent onslaught of pop-ups - including an owl bar and a crisp sandwich shop - we thought we'd seen all the world had to offer in terms of themed establishments.
But in Pittsburgh, Pennsylvania, a pop-up has just opened that we can really get on board with.
At Elana Schlenker’s shop Less Than 100, women pay less than men in a bid to equal out the gender pay gap.
In other words, you can "pay what you're paid."
American women working full time year-round currently make just 78 cents for every dollar their male counterparts make on average, but that gap varies by state. In Pennsylvania, women earn 76 cents on the dollar.
Here in the UK, the story isn't much different.
According to 2014 figures from the Office of National Statistics, women earn on average £2.53 less per hour than men – just 80p for every pound a man earns.
Schlenker's new shop aims to highlight such injustice, by charging women less than men per item.
While men are charged the full ticket price, women only pay 76% of the total.
"It's incredible how deeply unconscious biases still permeate the ways in which we perceive (and value) women versus men," Schlenker said in an interview with refinery29.
"I hope the shop's pricing helps to underscore this inherent unfairness and to create space for people to consider why the wage gap still exists."
The not-for-profit store sells ceramics, textiles, publications, art prints, stationery, and other goods created by women artists and makers from across the US.
Can we get one in the UK please?
11 Celebrity Quotes For Equal Pay Day
Beyoncé(01 of11)
Open Image Modal"We need to stop buying into the myth about gender equality. It isn’t a reality yet. Today, women make up half of the U.S. workforce, but the average working woman earns only 77 percent of what the average working man makes. But unless women and men both say this is unacceptable, things will not change."Men have to demand that their wives, daughters, mothers, and sisters earn more—commensurate with their qualifications and not their gender. Equality will be achieved when men and women are granted equal pay and equal respect." (credit:James Devaney via Getty Images)
Sheryl Sandberg(02 of11)
Open Image Modal"It's time to cheer on girls and women who want to sit at the table." (credit:Bloomberg via Getty Images)
Caitlin Moran(03 of11)
Open Image Modal"I want a zero tolerance policy on all the patriarchal bullshit." (credit:Stuart C. Wilson via Getty Images)
Hillary Clinton(04 of11)
Open Image Modal"Equal pay is not yet equal. A woman makes 77 cents on a dollar and women of color make 67 cents... We feel so passionately about this because we are not only running for office, but we each, in our own way, have lived it. We have seen it. We have understood the pain and the injustice that has come because of race, because of gender. And it's imperative that... we make it very clear that each of us will address these issues." (credit:Bloomberg via Getty Images)
Barack Obama(05 of11)
Open Image Modal"Women should earn equal pay for equal work." (credit:SAUL LOEB via Getty Images)
Gloria Steinem(06 of11)
Open Image Modal"If you say, I'm for equal pay, that's a reform. But if you say. I'm a feminist, that's a transformation of society." (credit:Jemal Countess via Getty Images)
Lena Dunham(07 of11)
Open Image Modal"So many women have come to this idea of feminism being anti-male and not able to connect with the opposite sex – but what feminism is about is equality and human rights." (credit:Stuart C. Wilson via Getty Images)
Janet Street-Porter(08 of11)
Open Image Modal"Far too many women are hesitant, and remain trapped in jobs for which they are over-qualified or paid beneath their worth." (credit:Ben Pruchnie via Getty Images)
Kerry Washington(09 of11)
Open Image Modal"Today there are people trying to take away rights that our mothers, grandmothers and great-grandmothers fought for: our right to vote, our right to choose, affordable quality education, equal pay, access to health care. We, the people, can't let that happen." (credit:Frazer Harrison via Getty Images)
Emma Watson(10 of11)
Open Image Modal"The reality is that if we do nothing it will take 75 years, or for me to be nearly a hundred before women can expect to be paid the same as men for the same work." (credit:Frazer Harrison/BAFTA LA via Getty Images)
Daniel Craig(11 of11)
Open Image Modal"A man is still likely to earn more money than a woman, even one doing the same job. You have a far better chance of entering political office or becoming a company director… Women are responsible for two thirds of the work done worldwide, yet earn only 10% of the total income and own 1% of the property… So, are we equals? Until the answer is yes, we must never stop asking.” (credit:Stephen Lovekin via Getty Images)