Pistol shrimp architecture (post your pics!)

[Fiver]

I've had my tiger pistol shrimp for a few months and love seeing what it does. I wasn't prepared to see it build little race track courses across the sand. One day, it built a little archway that led to a little pathway to its burrow. I wish I had taken a picture.

Here are some pictures of its current, less spectacular build. Please share yours! I'm curious to see what your shrimps are building.

[Fiver]

Another one: