Methods, circuits and apparatus for biasing an amplifier to maintain consistent operational characteristics over variations in fabrication processes and operational temperature conditions are disclosed. Semiconductor material is removed from below the nanoscale metal pattern to create trenches in the film having a depth-to-width aspect ratio of at least about 10:1, while pores are formed in remaining portions of the film adjacent to the trenches. Data based on interaction with the interactive video display system corresponding to video spots of the plurality of video spots is gathered. The edges of the flakes are fused to the edges of adjacent flakes such that open pores are defined between at least some of the adjacent flakes, thereby forming a network of metal flakes. The brake connects the second rotating element and the stationary member when the hydraulic pressure from the hydraulic pressure generation mechanism is not supplied. The mat of fibers includes a generally flat portion shaped to match the bottom of the shoe and a plurality of tabs formed of the mat at the edges of the bottom portion and projecting beyond the edges of the bottom portion with at least one tab at the front, two tabs at the rear and at least one tab at each side, with each tab having attached thereto a respective strap.