Avengers 4 is officially in post-production. Directors Anthony and Joe Russo shared a mysterious photo to announce the film wrapped on Friday. The image features an extremely bright flash of light, but it’s hard to make out what exactly is going on here.

Is is a coffin? Some sort of visual illusion? Are the Russo brothers trolling us? 

This photo follows another cryptic image from September with an equally elusive clue.

Earlier this month, Chris Evans bid farewell to Marvel and his role as Captain America. "Officially wrapped on Avengers 4. It was an emotional day to say the least,” he tweeted. “Playing this role over the last 8 years has been an honor.”

According to multiple reports, the first Avengers 4 trailer is dropping before the end of this year. Hopefully we won't have to wait too long to get a glimpse of the heroes in a post-Thanos snap world. The film hits theaters on May 3, 2019, following the release of Captain Marvel on March 8.