A cylinder has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base.
In projective geometry, a cylinder is simply a cone whose apex is at infinity, which corresponds visually to a cylinder in perspective appearing to be a cone towards the sky.
Tycho Brahe Planetarium building, Copenhagen, is an example of a truncated cylinder
A shape is a graphical representation of an object's form or its external boundary, outline, or external surface; it is distinct from other object properties, such as color, texture, or material type.
In geometry, shape excludes information about the object's location, scale, orientation and reflection.
A figure is a representation including both shape and size.
A children's toy called Shape-O made by Tupperware used for learning various shapes.