Clusters of atoms

A three dimensional illustration of various clusters of atoms.

Edit and compile if you like:

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% Clusters of atoms
% Author: Agustin E. Bolzan
\documentclass{article}
\usepackage[gray]{xcolor}
\usepackage{tikz,pgffor}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
\usetikzlibrary{shadows}
\begin{document}
%\begin{figure}
\centering
\begin{tikzpicture}
%\draw[help lines] (0,0) grid (10,10); %used just for visualising the positions of objects during construction
\begin{scope}[yshift=-180,yslant=0.5,xslant=-1]
    %the rectangular surface onto which the clusters are located
    \filldraw[black!10,very thick] (0.5,1) rectangle (10,7);
    %circle circumventing the smallest cluster 
    \node[circle,circular glow,fill=red!20,draw=red,thick]
    at (4.1,4.9) {\phantom{perimetro}};
\end{scope}
%atom clusters are rotated for a better visualisation
\begin{scope}[rotate around = {-5:(0,0,0)}]
    %text describing the objects in the picture
    \draw[-latex,thick] (6,3) node[right,text width=3cm] 
        {$\mathsf{potent\; perimeter\; sites}$} to [out=180,in=0] (4.5,1);
    \draw[-latex,thick](3,-1)node[right]
        {$\mathsf{Non-metallic\; molecule}$} to[out=180,in=0] (2.6,-3);
    \draw[-latex,thick](-3,-1)node[above]
        {$\mathsf{extra \; electron}$} to[out=-90,in=180] (-1.4,-2);
    %now we start with the clusters (maybe this code could be improved by a tikz expert)
    %the layers are built starting from the very lowest one
    %largest cluster
 
 
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