We Australians would call Bryson DeChambeau a "different cat".
Those who followed Adam Scott's group on Thursday would have probably come to that conclusion just by watching America's amateur superstar, one of Scott's playing partners.
They would have spotted him even before Scott, with the all-white, old school "Ben Hogan-style" cap, the bright green shirt, mid-green-coloured glove and dark green strip on his white shoes. 
That wasn't a mistake, either, but we will get to that at the end.
Even his caddie, a former college golfer and friend, Mario Clemens, has his own style, too. "He's a bit of a weirdo", DeChambeau jokes, before adding "but I love him anyway".
That's just the exterior. Then you talk to DeChambeau and you realise just how different he is to every other golfer playing the Australian Masters at Huntingdale Golf Club this week.
  Maybe every golfer, ever.
Take, for instance, how he explains his custom-made putter - which to the untrained eye just looks like a straight-edged block of metal stuck on the end of a handle; something Hogan might have played with in the 1940s and '50s.
"I wanted something that looked geometrically square and efficient for my brain to see proper lines," he said of the flat stick that is still in its "prototype" stage.
"And that's what we did. We came up with something that is clean, simple and didn't cast any weird shadows. That was a big issue. The back cavity of a putter, depending on the angle you are to the sun, and depending upon the time of the day as well, the putter is going to look completely different."
We should point out now that DeChambeau is a physics major in college. He built his own swing. Literally.
The world's No. 5 ranked amateur used a book called The Golfing Machine, written in 1969. It explains how there are 24 different components, and 144 variations that make up a swing. And whole bunch of other stuff that will only confuse you.
When he was 15, he started reading. Then he started experimenting. What he came up with is an exaggerated upright motion - not as aesthetically pleasing as it is mechanically - that has brought this response from many professional golfers who have seen it along the way.
"What are you doing, dude?" DeChambeau said of the feedback he has received. "This can't work out for you".
It has, though. The 22-year-old is one of only five men in history to win the NCAA and US Amateur titles in the same year. The others are Jack Nicklaus, Phil Mickelson, Tiger Woods and Ryan Moore.
On Thursday, he landed a "slam dunk" eagle on his second-last hole to finish at two-under and equal eighth. He did it using a wedge that has the same length shaft as the seven irons you and I play with.
That is the case with all his irons. The shafts are all the one length, rather than getting incrementally shorter by 1.25cm, from three iron to wedge.  
"The book talks about a 'zero shifting motion'. It's mainly for chip shots, but I just extended that out to full shots," he explained. "I figured out a way to combine big grips and the length of the club to maximise that motion."
It is also easier on the body. "You keep the same body posture, no matter the shot," he said. "I'm not bending over or extending my back."
Some call him the "Einstein" of golf.
"I'm no Einstein. I'm a great experimenter," he said. "I don't come up with mathematical theories. I come up with experiments that turn into a theory. I guess that's what scientists do to a certain extent. But I'm not this brain freak who just went, 'yep - this is going to work'. I had to experiment and go through the trails and errors."
He has used his high IQ and fondness for physics to give him an advantage. Or so he hopes.
But he does not come across as arrogant or pretentious - just passionate about the possibilities, and you get the feeling they are endless.
He does like to look good doing it, though, another passion of his. But he does it in that off-beat kind of way - the way LeBron James and the NBA stars do it in post-match press conferences.
"I get in there and look in my bag and say 'that would be cool to match all these things together," DeChambeau said of his attire.
"It's fun to look good. And if you look good, you feel good, and if you feel good, you can play good."