EXAMPLES
Figure 8.
Figure 9.
Figure 10.
Figure 8b displays a sequence of
nine 10x11 Lundadesigns generated by
introducing, step by step, more horizontal mirrors along the principal
diagonal (Figure 8a).
Figure 9b shows what happens if we introduce the
mirrors in pairs (Figure 9a). This time, the resulting Lundadesigns
have a twocolour symmetry: a halfturn about the centre interchanges
white and black. This also happens with the Lundadesigns in
Figure 10.
Figure 11.
In Figure 11a shows a sequence of three mirror designs, of
which the second and third generate the same Lundadesign (Figure 11b).
These Lundadesigns admit vertical and horizontal reflections.
The first preserves the colors, where as the second reverses black and white.
Figure 12.
Figure 12a displays three mirrors designs with twofold
rotational symmetry. The Lundadesign generated by the
first is also invariant under a halfturn about its centre.
In the second and third cases, a halfturn around the respective
centres reverses the colours.
Figure 13.
The symmetrical mirror designs in Figure 13a generate
Lundadesigns with horizontal and vertical reflections
which interchange black and white. (Many) Lundadesigns seem to me 
and to colleagues and students to whom I have shown them 
aesthetically appealing. Where do possible reasons for this lie?
What do all these Lundadesigns have in common? Which characteristics?
Do they possess specific symmetries?
