Unlike to most people I have met, rainbows are vile harbingers of disaster. At best they are the crossing point between our world and others so different so incompatible with ours that they are in effect evil without perhaps being actually so.
There are several different types - some I share with those I know and with the text books and those that I am the only or or one of a few see.
The basic 'real' type is the thin double concentric rainbow. It is always double although it can be broken-shafted (a Watergaw in lallans scots) the outer can often barely seen but it is always there - occasionally the outer 'secondary' is seen before the inner 'primary'
The first 'unreal' type that I only know that I can see is where thin rainbows are the same size and cross over each other. As you move along the primary becomes fainter and the one ahead brighter, then that one grows fainter and the next one brighter. You can often see three or more.
The second 'unreal' is like the last except it spins the fourth spatial dimension as you move and looks like it is turning inside out like a spinning tesseract.
The third 'unreal' is scattered across part of the sky.
The most scary is the fourth, the fat single rainbow. It is much wider than the real one and can exceptionally vivid. When a real rainbow is this vivid there is always a secondary, however faint. I saw one of these the other day. I managed to keep my head down and seek refuge with relatives. I waited until nightfall to go back home, thinking it could not be there at night. Unfortunately, when I reached the part of town I had seen it, it was still there in the same place brighter than ever making a sort of high tension electric cable noise except for a peculiar oscillation. I ran back home with my head down. It felt like I hadn't taken my medication, which I definitely had. It was as if the chemistry that causes me to have psychotic episodes was stronger than normal and ran roughshod over my medication. It took over a fortnight to wear off - it was if the ghost rainbow still shone through many objects and the noise took a long time to go away and a smell like no other.
Although I know that this can't be true: I have been warned but several representatives of government agencies have warned me of this last type of rain-horror, including the medical examiner who declared me sick for benefit purposes who said he had seen the fat single rainbows in his childhood.
It's tiresome chasing down and suppressing what seems evidently true with my own senses and working out what must and must not really true for the purposes of social integration and personal stability.