Lighting designer Cory Fitzgerald explains how Bieber elevated his arena tour for his most mature album yet.

It took a couple tries, he tells EW.

It gets everything wet, lets put it that way.

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Credit: Jeff Kravitz/FilmMagic

Lighting that box was basically just about isolating him for the beginning, Fitzgerald explains.

Its a really sort of minimalist idea.

ThePurposetour kicked off March 9 in Seattle and concludes Nov. 29 in London.

See the list of upcoming tour dateshere, and read EWs dispatch from the tour openerhere.