This is my response to 
This stuff is kind of street art in that it is located outdoors just next to a street. Although not a purist ideal of what street art actually is I don't really stand a chance at what it is that we have been competing in thus far so you'll have to take this instead. These works were obviously allowed because they are all sculptures and are one-of-a-kind and were likely paid for by someone.
There are about a dozen pieces here in this small park that is right next to the Han River and it was a very nicely maintained area that was actually being watered and cleaned up by ground staff while I was there.
Here's another one:
Now obviously these took considerably more time and materials than some mural on a cement wall and definitely cost a great deal more. It was part of a 2017 global art installation that sadly, not many people seem to be paying much attention to in Da Nang and the area isn't even used very much by the locals.
But i suppose I shouldn't be too judgmental seeing as how you can only look at something a certain amount of times before one no longer appreciates it anymore.
From what I can tell, the community here seems to be a bit more interested in statues or other solid works of art that are placed on the ground in parks than they are in murals or giant works of graffiti as appears to be all the rage in the back alleys of Thailand - so maybe we can alter the "deal" a little bit. See if you can find some statue or outdoor art installations that are in Chiang Mai to compare to these ones. After an extensive search today in 25km bike ride I can pretty much admit defeat as far as the search for spray art is concerned because while I did find plenty of vandalism, I didn't find anything that could be considered artistic.
If someone would like to see these pieces and many more here is where they are located
So tell me, what do you think?