2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150677Geometrical meaning of superstring pictures is discussed in details. An off-shell generalization of the picture changing operation and its inverse are constructed. It is demonstrated that the generalised operations are inverse to each other on-shell while off-shell their product is a projection operator.26 pages AMS LaTeX, Minor correctionsHigh Energy Physics - TheoryAlgebraic GeometryMathematical Physicstext