edit: I could see an argument that those two triangles are a consequence of the format of the image and are not quite the same as the other 17 which are part of the fractal structure. For example
if we drew the central triangles on a large piece of paper then there would only be 17 and not 19
I see 19. Are you counting the two large black triangles in the top corners?
I was not! Good eye
edit: I could see an argument that those two triangles are a consequence of the format of the image and are not quite the same as the other 17 which are part of the fractal structure. For example if we drew the central triangles on a large piece of paper then there would only be 17 and not 19