and networks, have not made contracts with Internet-distributed over-the-top MVPD services such as Sling TV and the now defunct PlayStation Vue. With the transition to over-the-air digital television broadcasts, many of the services are also often now available as standard-definition multicast channels on the digital signals of some member stations, while HD02 (PBS West) serves as a secondary HD feed. With the absence of advertising, network identification on these PBS networks was limited to utilization at the end of the program, which includes the standard series of bumpers from the "Be More" campaign. Independent networks While not operated or controlled by PBS proper, additional public broadcasting networks are available and carried by PBS member stations. The following three are also distributed by PBS via satellite. From 2002 to 2011, Buffalo, New York member station WNED-TV operated ThinkBright TV, a service that was carried on several stations in upstate New York. Several state networks also offer a public affairs subchannel network offering full-time coverage of state government events and legislative/judicial proceedings in the same vein as C-SPAN's coverage of the federal government. Many PBS stations also carried MHz Worldview from the MHz Networks until 2020 when MHz Networks announced its discontinuation of the network on March 1, 2020. Since then, many stations has switched to World Channel as well as First Nations Experience. A separate but related concept is the state network, where a group of stations across a state simulcast a single programming schedule from a central facility, which may include specialty subchannels unique to that broadcaster. Visual identity PBS introduced its first iconographic logo in 1971, a multi-colored wordmark of the network's initials with the P designed to resemble a silhouette of a human face. The logo was designed by Ernie Smith and Herb Lubalin of the Lubalin Smith Carnase design firm. Lubalin's human face "P", known internally at PBS as "Everyman", but more commonly known as the "P-Head", became the basis for all subsequent PBS logos. In 1984, PBS introduced a new version of the logo, designed by Tom Geismar of Chermayeff & Geismar. Chermayeff & Geismar felt that the Lubalin-designed logo was too similar to those of the three dominant commercial networks of the time, and they sought "to develop a symbol that could stand for the more inclusive concept of 'public television'". They inverted Lubalin's Everyman "P" to face to the right instead of the left,