I love building things.  I started building a house out of matches.
Cool! David Mach is a Scottish sculptor born in 1956
What is he known for?
Well, many of his pieces are temporary and constructed in public places. He is what I refer to as an opportunistic artist
Interesting!  Did he get permission to do these pieces, or was it on a whim?
Mostly on a whim. For example, one of his most influencial was called 'Polaris' which is a replica of a submarine to protest the nuclear arms race