def set_spow_enable(enable):
    """
    Sets *Colour* safe / symmetrical power function enabled state.

    Parameters
    ----------
    enable : bool
        Whether to enable *Colour* safe / symmetrical power function.

    Examples
    --------
    >>> with spow_enable(is_spow_enabled()):
    ...     print(is_spow_enabled())
    ...     set_spow_enable(False)
    ...     print(is_spow_enabled())
    True
    False
    """
    global _SPOW_ENABLED
    _SPOW_ENABLED = enable
