Kilder
https://graphicdesign.stackexchange.com/questions/156477/drawing-a-fibonacci-spiral-in-inkscape-without-the-extension
https://en.wikipedia.org/wiki/Golden_spiral
https://alpha.inkscape.org/vectors/www.inkscapeforum.com/viewtopic7abb.html?t=34196
https://inkscape.org/~joshbarts/★fibonacci-spiral