CLOSED SHAPE: a closed shape dosen shw a movement ---- OPEN SHAPE: creates a greater sense of movement and action ----
No, it is not.
No, a quadrilateral is a closed shape with 4 sides.
epiglottis
It is a 3-d shape
its the symetry of the shape in the which the petals are placed and open with a 3d dimension !
You get the shape of an envelope with its flap open.
It's a "LINE" or a "CURVE"
Any open shape with four right angles, including the crossing axes.
parallel lines.
Open cluster
It could be a plus (+) sign