I have not been lucky enough to visit Japan,though my parents have done so and they took many photos of this type of display,as they were so fascinated and impressed with them!
I have seen similar in various parts of Melbourne and it is truly amazing!
No, not been to Japan, one country for which I've no interest at all.
BUT have seen these 'plastics' in Asian Restaurant windows here!
First time, had to REALLY look at it closely, as was SO real looking!
While in Singapore 2 months ago for 3 days, we saw a large 3 tier display of plastic seafood mostly, on a stand outside a restaurant. It was even left there, after the restaurant closed for the night. We past it many times.