The purport of the contribution is an interpretation of structural elements of institutionalization in the past and present and their different consequences for sustainable development. Myths can arise not only when using incorrect data or overestimating some elementary aspects, but also on thin ice among visions, their applications, before verification of the results in practice. Therefore it is possible to find inseparable couples of visions – myths for example in situations where the feedback to sustainable development is not known. In evolution of mankind it forms the legitimate part of the processes where the problem is "to explore the ground" of the environment in common evolution of man and nature. Only the experimental feedback shows whether the vision is transformed to the shape of sustainable environment or it extincts in the "trapdoor" of myths.