Background in the fool card

ravenest

The blue could represent 'Masloth' - the 'sky' and the yellow , " the first form of the principle of vegetable growth implicit in the nature of the solar ray." - (king scale)

- yellow/brown flecked with white ; "a mystery of mercury ( improper to indicate clearly ) "

Improper ? ... :rolleyes:

Hint ; Liber 145 Opus Lutetianum


~ source ;

https://archive.org/stream/Liber777Revised/Liber777revised#page/n91/mode/2up