Well, as you'll from the image to the right, the upper eye is 'rendered' at low resolution e.g. 128 across by 64 tall (you can count the individual pixels that make the image) while its lower partners is rendered at something like 640 by 480 pixels, you can't count the pixels as easily but the image can hold MUCH MORE DETAIL.
It takes enormous amounts of brain power to render at such high resolutions. On top of all the emotional content of a dream, this resolution relates to the detail one might find in a CITY. The audio. The smells. The wind and rain. The cars and people passing by. The alien invasions, floods and monsters. And any other fantastical combinations of the above.
The DETAILS OF A PARALLEL WORLD in many cases, and this is EVERYBODY (not just one or two 'creative types' like one).
Some say dreams are a 'mere re-ordering of the day's events' or MAD aka Memory-Aiding Device where our finite-sized brain has all this new stuff crammed into it, integrated with the older stuff. We dream ON TOP OF our already existing memories? Our memories are flavoured by previous memories, previous dreams? We have a Dream Palette or Template? Such referential amendments to our existing memory set might explain the intimate detail of many of our dreams, if previous content is being 'opened' to be 'added to' to then be 'reclosed' for later use as 'conscious memories'.
But most of us don't remember our dreams.
There is research suggesting that 'remembering dreams' is bad for memory because it interrupts or interprets what should be a 'secret' or 'closed algorithm' compression method. Remembering our dreams means we've visualised the method or unravelled the compression function to 'see the content' of the dream. And that means our brains can't store the relevant memories as efficiently as if we 'hadn't remembered the dream'. Then, why are 'some dreams' so emotionally charged that we're FORCED TO REMEMBER THEM by being awoken from them in a sweating panic?
Simple question: why are our dreams rendered at SUCH HIGH RESOLUTION if we're not supposed to remember them?