# Isometric projection start point

I have a question about isometric projection: Why did in all tutorials and examples start point for isometric is in left top corner ? For example in cocos2d 3.1 my start screen point in left bottom, so left top isometric position will nearly 1500,1500. So is it normal to make start isometric point in left bottom corner ? i mean :

x,y
0,3 1,3 2,3
0,2 1,2 2,2
0,1 1,1 2,1
0,0 1,0 2,0


or better

0,0 1,0 2,0
0,1 1,1 2,1
0,2 1,2 2,2
0,3 1,3 2,3


sorry for stupid question