An electro-optic device comprising: a first electrode structure comprising: a first electrode layer comprising a concentric first plurality of electrode rings, each adjacent pair of electrode rings from said first plurality of electrode rings separated by a corresponding first layer separator from a concentric plurality of first layer separators; and a second electrode layer comprising a concentric second plurality of electrode rings, each adjacent pair of electrode rings from said second plurality of electrode rings separated by a corresponding second layer separator from a concentric plurality of second layer separators; wherein: said first electrode layer is positioned parallel to said second layer; a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; and, when viewed from a point along the rotational axis, an electrode ring from the first layer is not optically aligned with a spatially nearest electrode ring of the second layer, characterized in that said second electrode layer is configured to be operably conductively unconnected to an electrical power source. a first electrode structure comprising: a first electrode layer comprising a concentric first plurality of electrode rings, each adjacent pair of electrode rings from said first plurality of electrode rings separated by a corresponding first layer separator from a concentric plurality of first layer separators; and a second electrode layer comprising a concentric second plurality of electrode rings, each adjacent pair of electrode rings from said second plurality of electrode rings separated by a corresponding second layer separator from a concentric plurality of second layer separators; wherein: said first electrode layer is positioned parallel to said second layer; a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; and, when viewed from a point along the rotational axis, an electrode ring from the first layer is not optically aligned with a spatially nearest electrode ring of the second layer, characterized in that said second electrode layer is configured to be operably conductively unconnected to an electrical power source. a first electrode layer comprising a concentric first plurality of electrode rings, each adjacent pair of electrode rings from said first plurality of electrode rings separated by a corresponding first layer separator from a concentric plurality of first layer separators; and a second electrode layer comprising a concentric second plurality of electrode rings, each adjacent pair of electrode rings from said second plurality of electrode rings separated by a corresponding second layer separator from a concentric plurality of second layer separators; wherein: said first electrode layer is positioned parallel to said second layer; a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; and, when viewed from a point along the rotational axis, an electrode ring from the first layer is not optically aligned with a spatially nearest electrode ring of the second layer, characterized in that said second electrode layer is configured to be operably conductively unconnected to an electrical power source. said first electrode layer is positioned parallel to said second layer; a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; and, when viewed from a point along the rotational axis, an electrode ring from the first layer is not optically aligned with a spatially nearest electrode ring of the second layer, characterized in that said second electrode layer is configured to be operably conductively unconnected to an electrical power source.