Input image:

Showing:

Projection:

Generating Elements:

Generating Elements:

Number of elements:

Basic quadrilateral (heavy lines)
Rotational symmetries at intersection between:

straight lines
upper line and circle
circles
lower line and circle

sum of angles =

Size of upper circle:

Fractal character:

Center circle: (medium line)
Rotational symmetries at intersection with

lower circle
upper line
lower line

Output image:

Output image size: