“He knew that the idea of Echo was a personal fantasy from his inner life, an idea that could survive in his mind but not withstand the scrutiny of others. But the appearance of the rabbit in the world outside him had strengthened the idea, giving it the potential to grow and evolve and become more elaborate and intricate. Such constructions grow secretly in many minds, acknowledged and understood only by their creators.  Their imaginary nature, however, does not mean that they are unable to affect the world at large.”

https://library.hrmtc.com/2024/11/05/he-knew-that-the-idea-of-echo-was-a-personal-fantasy-from-his-inner-life-an-idea-that-could-survive-in-his-mind-but-not-withstand-the-scrutiny-of-others-but-the-appearance-of-the-rabbit-in-the-wor/

“The basic idea is very simple. You make up an imaginary world that you would enjoy being in, and then you imagine yourself walking around in this world. Not much different, in principle, than what people do in any ordinary daydream. But here the idea is to work for consistency, so that it appears the same every time you enter it, and to continually add details to it. With practice and familiarity, this imaginary world will begin to take on a sense of being a ‘real’ place; not real in the same way as the physical world, but having a permanence about it nonetheless.”

https://library.hrmtc.com/2024/07/23/the-basic-idea-is-very-simple-you-make-up-an-imaginary-world-that-you-would-enjoy-being-in-and-then-you-imagine-yourself-walking-around-in-this-world-not-much-different-in-principle-than-what-p/