tiling by B-bar gliders at -6 in 12 generations

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**Figure 2.20:** B-bar gliders have the same velocity as B gliders, but take three times as long to develop their cycle; however the two types, B and B-bar, may coexist.
$\begin{figure}\centering\begin{picture}(300,150) \put(0,0){\epsfxsize = 300pt \epsffile{nakedBbar.eps}} %------------- \end{picture}\end{figure}$

**Figure 2.21:** B-bar gliders can have varying widths and one or the other of two optional right margins. At least one midsection must be included.
$\begin{figure}\centering\begin{picture}(250,220) \put(0,0){\epsfxsize = 250pt \epsffile{clothedBbar.eps}} %------------- \end{picture} \end{figure}$

Jose Manuel Gomez Soto 2002-01-31