Doyle spiral
... that circle packings in the form of a Doyle spiral were used to model plant growth long before their mathematical investigation by Doyle?
... that circle packings in the form of a <b id="mwA_E"><a href="./Doyle_spiral" id="mwA_I" rel="mw:WikiLink" title="Doyle spiral">Doyle spiral</a></b> <i id="mwA_M">(pictured)</i> were used to model plant growth long before their mathematical investigation by Doyle?