Testing the circles was done in extreme circumstances. Professor James Cameron made it clear that when the circles were to be set out in the open, the people of Britain should be able to use the object in a safe and proper way. For instance the colour of the circle should not change or slowly become sallow. Because this could cause stress within the population. The surface structure, depth, measurement and weight ought to be comparable with the colour of the circle.
Undependability of the balance between the different elements could cause PTCD (Post Traumatic Circle Disorder).