For the vast majority of us, mundane reality gives the required normalcy for prediction, decision, and action. If your crossing the street, what's pertinent is how far away is the approaching car. Not the singing bird, wind blowing, yellow house, feeling fat, etc., assessing the car is pertinent to survival. Culture sculpts MP, and helps to prioritise our life. To the rain forest native, the bird and wind, is pertinent to their survival.
Western cultures emphasis quantitative audio-visual as the working reality.
So it is, often at the expense of our innate sense of prioritising. There are probably as many alternative realities as there are grains of sand on the beach, an infinite number. To begin with every individual has their own sense of reality. Then we have the various types of dreamstates. Understanding these alone can keep one busy a lifetime.