Colour shifting is when objects within the environment fluidly shift and change their colour through a continuously repeating cycle.  For example, moss on a rock could visibly shift from green, to red, to blue, to any other colour, and then back to green again in a smooth and seamless animated loop. This effect is particularly strong and likely to occur if the objects original colour was bright or out of place.
Colour shifting is often accompanied by other coinciding effects, such as colour enhancement and colour replacement. It is most commonly induced under the influence of moderate dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline. However, it can also occur to a lesser extent under the influence of certain stimulants such as MDMA.
- Kleinman, J. E., Gillin, J. C., & Wyatt, R. J. (1977). A comparison of the phenomenology of hallucinogens and schizophrenia from some autobiographical accounts. Schizophrenia Bulletin, 3(4), 567. | https://dx.doi.org/10.1093/schbul/3.4.560