What notable characteristic does the Helen Keller statue have?

The Helen Keller statue, which is part of the National Statuary Hall Collection in the United States Capitol, holds the unique distinction of being the only statue that can be touched. This interactive feature not only aims to provide a more engaging experience for visitors but also symbolizes Helen Keller's profound impact on advocacy for people with disabilities and her quest for accessibility and understanding. It reflects her achievements and helps to invite a deeper connection between the statue and the viewers, going beyond mere observation.

The other options do not align with the characteristics of the Helen Keller statue. While it is indeed crafted from marble, it does not uniquely stand out for this aspect alone, as many statues in the Capitol are also made of stone materials. The claim of making it the tallest statue in the Capitol is inaccurate, as there are taller statues present. Likewise, the statue does not feature any moving parts, as it is a traditional representation rather than a kinetic sculpture. Thus, the emphasis on its touchable nature positions the Helen Keller statue as a distinctive and meaningful piece within the Capitol grounds.