\documentclass[crop,tikz]{standalone}
\input{common-headers}

\begin{document}

\tikzset{cell color/.style={black!20}}

\newcommand{\common}{%
  \coordinate (ll) at (0cm,-1cm);
  \coordinate (ur) at (5cm, 3cm);
  \draw (ll) rectangle (ur);
  \clip (ll)+(0.1cm,0.1cm) rectangle ([shift={(-0.1cm,-0.1cm)}]ur);
}

\begin{tikzpicture}[
  every node/.style={draw, inner sep=0cm,
    minimum width=10pt, minimum height=10pt},
  arrowed/.style={-Stealth, out=-90, in=90}]
  \common

  \node (h1) at (1,2) {};
  \node (h2) at (2,2) {};
  \node (h3) at (3,2) {};
  \node (h4) at (4,2) {};

  \node (m1) at (1,1) {};
  \node (m2) at (2,1) {};
  \node (m3) at (3,1) {};
  \node (m4) at (4,1) {};

  \node (b1) at (1,0) {};
  \node (b2) at (2,0) {};
  \node (b3) at (3,0) {};
  \node (b4) at (4,0) {};

  \draw[arrowed] (h1) to (m2.north) (h3) to (m2.north) (h2) to (m2.north);
  \draw[arrowed,dashed] (h2) to (m3.north) (h4) to (m3.north) (h3) to (m3.north);

  \draw[arrowed] (m1) to (b2.north) (m3) to (b2.north) (m2) to (b2.north);
  \draw[arrowed,dashed] (m2) to (b3.north) (m4) to (b3.north) (m3) to (b3.north);
\end{tikzpicture}

\begin{tikzpicture}[
  c/.style={draw, inner sep=0cm,
    minimum width=10pt, minimum height=10pt},
  arrowed/.style={-Stealth, out=-90, in=90},
  mix/.style={draw, circle, inner sep=1pt}]
  \common

  \node[c] (h1) at (1,2) {};
  \node[c] (h2) at (2,2) {};
  \node[c] (h3) at (3,2) {};
  \node[c] (h4) at (4,2) {};

  \node[mix] (q1) at (1.5,1.5) {};
  \node[mix] (q2) at (3.5,1.5) {};

  \node[c] (m1) at (1,1) {};
  \node[c] (m2) at (2,1) {};
  \node[c] (m3) at (3,1) {};
  \node[c] (m4) at (4,1) {};

  \node[mix] (q3) at (2.5,0.5) {};

  \node[c] (b1) at (1,0) {};
  \node[c] (b2) at (2,0) {};
  \node[c] (b3) at (3,0) {};
  \node[c] (b4) at (4,0) {};

  \draw[arrowed] (h1) to (q1) (q1) to (m1);
  \draw[arrowed] (h2) to (q1) (q1) to (m2);
  \draw[arrowed] (h3) to (q2) (q2) to (m3);
  \draw[arrowed] (h4) to (q2) (q2) to (m4);

  \draw[arrowed] (m2) to (q3) (q3) to (b2);
  \draw[arrowed] (m3) to (q3) (q3) to (b3);
\end{tikzpicture}
\end{document}