Mayor Marty Walsh joined in on the Rob Gronkowski-Julian Edelman T-shirt game today.

Walsh posted a picture of himself on Twitter sporting a T-shirt with a picture of Edelman wearing a shirt with a picture of Gronkowski wearing a shirt with a picture of Edelman wearing a shirt with a picture of Gronkowski. Got it?

Here’s the photo:

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Edelman also chimed in on Walsh’s move:

Here’s how the back-and-forth T-shirt battle breaks down. The two Patriots have recently been engaging in an Inception-esque T-shirt battle that was inspired by the T-shirt battle between actors Ryan Gosling and Macaulay Culkin. Edelman first sported a shirt with Gronkowski’s likeness on May 19. The next day Gronkowski wore a shirt with an image of Edelman sporting that first shirt. And the back and forth went on from there, with Edelman wearing the last shirt (so far) in the battle between them on May 22.