An Aesthetic idea (n.) joins spirit to language, which on its own is a mere thing of the letter.
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An Aesthetic idea (n.) is an image that provokes much thought which no concept can match and language can never fully capture.
An Aesthetic idea (n.) is the mirror image of a rational idea: an intuition no concept is adequate to, as the rational idea is a concept no intuition is adequate to.
An Aesthetic idea (n.) speaks through attributes — Jupiter's eagle with lightning in its claws: not a logical mark of majesty but a prompt that sends imagination flying over a host of kindred images, more than any concept can say.
An Aesthetic idea (n.) is an inexponible representation of imagination, as a rational idea is an indemonstrable concept of reason.