I am experimenting with an online seal generator, the text I have entered is 一千五百 and I have noticed that the characters go first from top right to bottom right, then from bottom left to top left. Is this correct?
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The general principle is from top to bottom, from right to left, but the format can be very flexible. For a four-character seal, there are 6 ways to arrange the characters (see picture). Seal calligraphers normally pick the arrangement that is most aesthetically pleasing, depending on how the character is written & number of strokes per character, etc. The only exception I'm aware of is for 4-character seal, the 2nd format in the picture breaks the right-left rule but that particular one has a particular name called 回文布排 ie "anti-clockwise" that is for 4-character seal only.
picture taken from http://www.shufazidian.com/shuji/article.php?acid=21&arid=41