Thanks to Gregg Tavares who emailed us, we have more details on this unusual sculpture. From Asakusa-Sumidagawa port of Tokyo, we took a ferry boat back to Tokyo Bay . During the 40 minute ride on the Sumida River, we passed many famous bridges and the fort of Daiba. The fort of Diaba is an artificial isle constructed in 1853 as a cannon battery to protect old Tokyo. The boat ride was very relaxing and allowed us to view Tokyo from a different perspective.
Day turns into evening as boats move along the river.