Visual Form Constancy. Visual Form Constancy is the ability to mentally manipulate forms and visualize the resulting outcomes. This skill also helps children recognize an object in different contexts regardless of changes in size, shape, and orientation. Children with poor form-constancy may struggle to recognize objects when turned a different direction or viewed from a different vantage point. They can fail to recognize words they know that are presented in a different manner, i.e., written on paper, in a book, or on the board.