the mark of Thor.

Sometimes when people are struck by lighting it leaves a phenomena known as Lichtenberg figures, branching lightning-like shapes where the current has caused blood vessels to burst, sometimes permanently scarring the skin.

[crafted by user blabbit's father.]

This lightning effect naturally occurs in what's called fractal wood, and can also be artificially made by attaching conductive rods to a transformer, juicing it up and letting the patterns burn into the wood's surface.

When lightning strikes certain places, it leaves what's called fulgurite, fused tubes or masses in and sometimes above the ground, also informally called "petrified lightning".

The high-voltage crystallization effect can be reproduced like the skin or wood above to make "lightning in a bottle" designs within acrylic spheres, blocks, or panels.

[Note use of the hammer.] 

All are the impactful fingerprints of Thor leaving his mark.

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Guillermo Maytorena IV knew there was something special in the Norse Lore when he picked up a copy of the d'Aulaires' Norse Gods and Giants at age seven. Since then he's been fascinated by the truthful potency of Norse Mythology, passionately read & studied, embraced Ásatrú, launched the Map of Midgard project, and spearheaded the neologism/brand NorsePlay. If you have employment/opportunities in investigative mythology,  field research, or product development to offer, do contact him.