the color of burnt bread's crust-
bread's crust such as Okinawa being cut off
depending on time
From "Mimi Futahira" written by Yuriko Matsumura
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Obviously,crust of bread is a part of bread.What crust differs from the inside is just the color and the consistency.Because of such differences,therefore,crust is likely to be cut off for any purpose.
The author felt that crust of bread is similar to Okinawa which has been sacrificed for the main island of Japan.In my opinion,this tanka is expressed the instability of human mind,and makes us be aware that Okinawa belongs to us all,Japanese.