One of the most vocal critics of abstract expressionism at the time was New York Times art critic John Canaday. Meyer Schapiro and Leo Steinberg along with Clement Greenberg and Harold Rosenberg were important art historians of the post-war era who voiced support for abstract expressionism.
Keyboards should be of appropriate size and key-spacing to accommodate most users. Generally, the horizontal spacing between the centers of two keys should be 0.71-0.75 inches (18-19 mm) and the vertical spacing should be between 0.71-0.82 inches (18-21 mm) (Figure 9).
They are called vertical pianos because of their height and the position of the strings. The height range of the vertical piano is between 36 - 60 inches. The Upright or Vertical piano is the most common piano due to its affordability, compactness and warm sound. The soundboard is vertical, strings and dampers stretching downward, hammers and dampers horizontal to the board.