Each boards in completely unique. There will never be an identical board because of how the boards are made.
The ne·far·i·ous effect
When a large amount of electricity is discharged, the insulator material starts to react. As this reaction occurs, branching fern-like conductive channels form extremely quickly allowing the trapped charge to rush out in a large spark. During this discharge process, the powerful electric charge leaves (up to) 100s of branching fractals.
Nefarious comes from the Latin nefas "crime, impiety." If something is nefarious, it is criminal, evil, malicious and wicked.