You can't judge the City of Perth's latest public art offering until you've walked a mile in their shoes - which, over the next two weeks, they will give to you in exchange for what's on your feet.
Confused?
The council, as part of its TRANSART 2016 program, will be creating a public artwork using the second-hand shoes of 100 strangers in the CBD and surrounds.
Being a part of the artwork, however, is not as easy as it sounds - but it does have its rewards.
From Thursday to October 23, "undercover ushers" will be roaming Perth's "urban" areas wearing Nike Air Max 90 sneakers.
Eagled-eyed people who spot the ushers can approach them and ask to have the shoes they are wearing on their feet, swapped for a brand new pair of free Air Maxes - valued at around $120.
The locations of the ushers will be posted on the council's Twitter account each day.
"Members of the public will then be invited to locate the usher, who will escort them to an undisclosed location to complete the exchange," The City of Perth's website read.
"Participating recipients must exchange the shoes they are wearing for their new Air Max sneakers, and must leave the exchange location wearing their new kicks."
The Do It For Free temporary public artwork project, commissioned by the council and created by artist David Attwood, will conclude with a public exhibition of the collected second hand shoes alongside photographic documentation of the project.
The city, however, is keeping the location of the exhibition under wraps for now.
City of Perth mayor Lisa Scaffidi said TRANSART was one of the flagship projects in a new chapter of temporary public art commissioned by the City of Perth to enhance the cultural experience in the city.
"We hope Do It For Free will entice people to rediscover and interact with the people and places in the city," she said.
According to the City of Perth website, the artwork plans to "use the cultural connotations of Nike Air Max sneakers and their exchange with the public as a means of exploring alternative relationships between commodities and communities more broadly."