Quote:
Originally Posted by Sunfish
Hexagons do not tessellate into a spherical surface. You would need to add pentagons. In addition you would need to find some first surface hexagonal and pentagonal mirrors or make your own with silver coating and they would still need to be ground or slumped I think to get anywhere close. Perhaps it would work with gaps in the mirrors to parabolise or add a corrector.
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Yes Ray, you are of course correct. I was thinking that there would be gaps between the tiles to allow the flat tiles to parabolise on the curvature of the substrate form. Typically mesh backed mosaic tiles have a separation to allow for grouting, said separation could allow for the necessary curvature. I am not suggesting it would be a high quality instrument, but it could work reasonably well for amateur use if you accept the limitations of production mirror tiles.