美しい(うつくしい)青空(あおぞら)を見ても、現実の空を見ずに頭の中の「青(あお)」という文字だけを浮かべる病気

The magic of characters warps reality. For example, a person who read of the 'blueness of the sky' through characters will, even when standing before the beautiful real blue sky, not look at the sky but only recall the character 'blue' inside their head. Through this, humans become unable to experience the genuine beauty of the real world, afflicted with a 'disease' where they can only recognize everything through the medium of characters, Nabu warned.