Any new object in the real world is assimilated into the astral dimension over a period of time. A thought form representation of it first grows in the lowest part of the astral, close to the physical dimension, becoming more and more permanent as time goes on. As with all thought forms, the more attention paid to it the quicker it grows.
The higher up in the astral dimension, or the further away from the physical, the less thought forms, of the physical world, as we know it, are found. Physical things have to soak in to it for a very long time before they take shape, and are found, in the higher astral.
Have you ever tried to move around a strange house in the dark? You bump into everything, right. But as you become familiar with it though, a mental picture of your surroundings forms in your mind, and you can find your way around it better. The longer you spend in this house the stronger this mental picture becomes. This is similar to how things are assimilated and grown, as thought forms, in other dimensions.
The generation of thought forms in the astral also works in the reverse. If a physical object has been around for a very long time, it will have grown a lasting thought form impression in the astral. After the object is destroyed or removed, its thought form still endures. You may, for example, in the astral, find furniture in your house you don't have, jumbled up with your own. This is caused by the decaying thought forms of old stuff, belonging to previous tenants etc, still being there, years after the originals have gone.
Old thought forms do not follow their physical counterpart around when they are moved. New ones begin to grow in the astral wherever it is while the old ones slowly decay. The longer a thing is in one place, the stronger the thought form will become in that place. This also applies to buildings, structures and geological features. You may project into a park and find a house, bridge, stream, hill etc that you know is definitely not there. These may have existed in times past. The higher up in the astral you go, the older the thought forms are, or the further back in geological time you appear to be.
The rate of growth of a thought form depends largely on the amount of attention paid to it. For example, a famous painting; loved, viewed and highly thought of by millions, will have a much stronger thought form than that of a common painting that hangs in someone's bedroom and is only viewed by a few. The number of thought forms you find in the astral also depends on how close you are to the physical dimension. If you are very close, as in a real time projection or OOBE, very few thought forms, if any, will be found. In a real time OOBE you are not quite in the astral dimension but are existing as an astral form in the buffer zone between the astral and the physical dimensions.
