The International Symbol of Accessibility (ISA), more widely but less correctly known as the handicapped sign, is evolving. The original symbol (far left), designed by Susanne Koefoed in 1968, was pretty much just a stylized wheelchair. The International Commission on Technology and Accessibility (ICTA), a committee of Rehabilitation International, humanized the it by adding a head (second from left). This is the icon we are most familiar with. Critics complain that its static nature stigmatizes the wheelchairs as instruments of helplessness and passivity.  In 2005, VSA, an international organization on arts and disability, produced a more active icon implying self-propulsion (third from left). At least one store,...