Plants fold the light into plant matter, exhaling oxygen. Animals breathe oxygen and exhale carbon dioxide which the plants breathe. This is an example of a symbiotic loop. With the continuing flow of sunlight, the loop grows. More plants means more animals.
More animals means more plants.
A causal loop that resonates. From within the Dodecahedron web page one might follow the hyperlink to Cube , from Cube to Octahedron , from Octahedron to Golden Proportion , from Golden Proportion back to Dodecahedron . Language loops are frequent when consulting a dictionary for definitions of words. A complex structure of loops somehow brings meaning to our language. Look for loops and you will begin to see more loops around you.