What is the Maruagara on the pink boat?

We operate a pink boat "Aduma" which has Maruagara on the hull.
It is a collaboration with Azumaya whose head office is in Sumida-ku, Tokyo.
The Maruagara is characterized by "あ" in an irregular polka dot pattern
that imaged by the surface of the Sumida River.
Enjoy the modern Tokyo on a "Maruagara" Yakatabune!
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