When we stare at works of art, such as a hanging scroll, we may be fascinated by their beautifully harmonious shape rather than the meaning of letters drawn there. Everyday, we see many letters and have different impression by the difference in the kind of letters or fonts. There are various words to express our impression, e.g., grace, hardness, and graveness. We are taking interest in what of a letter these impressions originate. We have taken notice of the relation between the impressions of Hiragana letters and the characteristics of Fourier transforms of them. This paper describes the fact that we have found in this relation.