At the beginning of this month, William Shatner sent out a request to his 2.25 million Twitter followers: send me your selfies.

Shatner requested fans send selfies of themselves flashing the iconic Star Trek “live long and prosper”; Vulcan salute, but didn’t explain why.

We found out on Aug. 9 when the 84-year-old actor tweeted a mosaic of his former co-star, comprised of thousands of selfies, as a tribute to the late actor.

// a series of follow-up tweets, Shatner explained that the image of Mr. Spock was made up of more than 6,000 selfies submitted by fans, and was created in conjunction with @GISHWHES (the Greatest International Scavenger Hunt The World Has Ever Seen), a project spearheaded by Supernatural star Misha Collins — who even contributed a selfie of his own: