2-dimensional crystal II

You may see a grater. What I see is a 2-dimensional crystal. Might be a side effect after several decades in solid state physics.

 

For macro Mondays theme "iron". Size of each hole is about 2mm. And yes, it is magnetic, so I hope this is enough iron for the theme.

 

Nikkor 50mm f/1.4 + 20mm extension tube.

Done