I'm trying to redraw the diagram diagram below. I'm using it as an exemplar/reference in a document I am writing but I need it to be clearer hence the redraw.
I tried and failed to draw it in Inkscape. After thinking about it for a while though, I thought actually it could be done (and perhaps better) mathematically using something like Tikz. I've looked through the questions here and I can find similar but not what I need.
So far, my code is a just a pathetic cloud and an oval and missing the crucial 2D spiral cone:
\documentclass[]{minimal}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage{tikz}
\usetikzlibrary{shapes}
\usetikzlibrary{automata,positioning}
\begin{document}
\begin{tikzpicture}
\node [cloud, draw,cloud puffs=10,cloud puff arc=120, aspect=2, inner ysep=1em,text width=1cm]{Needs\\and\\Ideas};
\draw (0,-10) ellipse (4 and 2);
\end{tikzpicture}
\end{document}