1 Corinthians 15:52 says we will be changed in an instant, in the twinkling of what?

Answer: An eye

"In an instant, in the twinkling of an eye, at the last trumpet... the dead will be raised imperishable, and we will be changed."

“Listen, I tell you a mystery: We will not all sleep, but we will all be changed— in an instant, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, the dead will be raised imperishable, and we will be changed.”— 1 Corinthians 15:51-52 (BSB)