Tessellated hexagons might be interesting - they have the advantage of being closer to a circular target. Apparently I'm not the first one to think of that - a

Tessellated hexagons might be interesting - they have the advantage of being closer to a circular target. Apparently I'm not the first one to think of that - a quick check threw up http://www.freepatentsonline.com/5805157.html http://www.freepatentsonline.com/5805157.html