(or fundamental geometric pattern)

is it a square?

a circle?

a triangle?

a fractal?

a pentagon?

i try to think of as many geometric shapes as possible using a line, since one line is sufficient to draw a 2d shape, and they can be reduced to below:

linear shape ( sides made of only lines)

curved shape (circular)

shapes with both linear or curved lines

shapes with right angle and vertices

shapes with non right angle and vertices

of course I am ruling out the 3 dimensional objects since they are just mixture of objects in two dimensional.