The wondrous rainbow flag made up of massive lasers will again flood San Francisco’s Market Street on Friday, June 23 and will continue for 3 nights, ending Sunday.

Called WELCOME (#WelcomeSF), the 4.1-mile installation by arts nonprofit Illuminate debuted last year to great fanfare, setting off celebrations up and down the length of Market Street. With a 49-foot width and a length exceeding four miles, the installation will consist of six colored laser beams (purple, blue, green, yellow, orange, red) shooting horizontally above Market Street, rising at a subtle 3-degree angle to crest at Twin Peaks and represents the world’s largest pride flag.