These words are designed to sound not only like thunder but like rumble of the thunders - happening inside the readers head. 

There are several sources of inspirations. 

First source is Dada. All the cut-ups and sound poems of Mr. Schwitters, Mr. Ball, Mr. Hausmann. Their primal expressions and their force - phrases for the Destructive Character  to make room. 

Of course i have to  aknowledge Mr. Marinetti, futurism and BLAST magazine. But in this case - only in choice of the font. 

The other important person is Antonin Artaud and his "To have done with the Judgment of God". His ability to clean the soul with horror - was single biggest inspiration for the project. 

Also keep in mind mr.Joyces THUNDERWORDS - they caused "What if" scenario which led to the poems you can read at the moment. 

Phrase from Mr.Gysin "Rub out the word" and Mr.Spare method of sigization were driving force in the creation of these poems.