The figure needs to be understood a 3D view from viewer. So, try to imagine a child flexible ball (circle with arrows). You can touch and mold it to fill internal small balls (like tennis balls) with earth elements (land, fire, water and air) and its products (energy, soil, flow, wind). This internal balls comprises the "human orbit perception" that can feel permaculture ethics and design principles. Only after these senses, it comes the sustainable techniques and applications.
The SVG version uses "Indie flower" font originally.

This image is used for teaching purposes on Permaculture Research Group - Federal University of Santa Catarina - Brazil - http://permacultura.ufsc.br/?lang=en
Own work
Arthur Nanni