The hexadecimal color code #6678a1 is a shade of blue. In the RGB color model #6678a1 is comprised of 40% red, 47.06% green and 63.14% blue. In the HSL color space #6678a1 has a hue of 222° (degrees), 24% saturation and 52% lightness. This color has an approximate wavelength of 474.31 nm.
There is no must in art because art is free.
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Nature is not only all that is visible to the eye.. it also includes the inner pictures of the soul.
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If I were called upon to define briefly the word Art, I should call it the reproduction of what the senses preceive in nature, seen through the veil of the soul.
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