In one embodiment of the present invention there is provided a filter having a first spiral support member having a first end and a second end, a second spiral support member positioned adjacent the first spiral support member to form an open loop between the first end and the second end of the first spiral support member; and a filtering structure attached to the open loop. In combination these traits set \u2018REKOHU SUNRISE\u2019 apart from all other existing varieties of Carex known to the inventor. Tuning is achieved by translational movement of the cavity-tuning reflective dielectric film stack in a controlled electrostatic field. The ideal signal is combined with the error signal producing an ideal signal with errors. The device may be used to train a player in offense as well as defense. The plurality of manipulation members is accessible to a lifter so that the lifter can apply force to the plurality of reinforcing members and can move the load reliably supported by the flexible, substantially planar member.