Imagination plays with characters you see, but characters which have an idea at their basis (they are imaginary, they don't have a spirit as we do, but they have an idea they need to take care of)... some characters also have bodies to dress that idea. Others don't, as they are special “ideas”, needed for the very structure of imagination, not just its plays. At first there were some grey ideas, very old ideas, coming from our subconscious (they are not unconscious, yet neither fully consciously manipulated) and they are broken ideas, because they weren't good enough to make it in the final structure and purpose of imagination - their place was taken mostly by the colored ideas that have hues and can, thus, represent good and evil ideas. Good ideas are also called defenders. Bad ideas are also called attackers. At first there were characters that only had ideas, and no body to dress them – these were called the first ideas or original. They protect or hunt down the other characters who have a body to cover their inner idea. When the body dies, they become torn ideas, torn form their body and realm.
The defending ideas collect torn ideas that were virtuous and take them in their High Citadel. The attacking ideas hunt down those that did not respect the rules of a fair life and bring them in the Deep Citadel. These Citadels are merely imaginary and not absolute, therefore different from their real source of inspiration. The consequence of these Citadels being merely imaginary is that they are rather flexible and fulfill different purposes and needs, for imagination only and not reality. Expect things to be different in imagination, even if their purpose is to enlighten us about reality (this is my theory). Once taken by wither side, the torn ideas are rewarded or punished and after a long time they might get the chance to do this work themselves.
The black bleeding heart is a symbol for attacking ideas.
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This particular drawing however shows a symbolic imagery of a defender - usually bright colors and lots of light. I don't use circles as symbols for my stories, and they have been replaced by other curved shapes or whatever that would have moved around the being if it were an animation.