It is now clear, the internet is actually a time machine. It in fact does transcend time and space.
On this 1944/5 map, you can see the Danshui Public Hall - managed by Mr Hirokawa's grandma. A picture of this Hall, previously posted on the net, has led to the discovery that Mr Hirokawa's house was diagonally across the street from Eyedoc's house, which in turn was a stone's throw from Cho-san's house. And the Public Hall and the post office nearby were both built by Cho-san's dad.
All three are Tamsui-lang, born and raised, now residing away from Danshui. All have gone back to visit albeit at different times. And yet, through the net (and the net only), old pictures and/or common memories are exchanged and shared. We have even found that at least two older Danshui-ren were students of Mr Hirokawa's father at Danshui Public School, class of 1939.
Indeed, "it's a small world after all".
There is more: Mr Hirokawa also remembers being treated for stomach ailments by a local medical doctor. And a map, drawn from memory by his father, shows Japanese small shops dotting the whole length of the now Chung Cheng Road. Cho-san also recalls a very popular noodle shop.