Variations on Steiner’s Porism

Steiner's porism is a remarkable theorem of Euclidean geometry from the 19th century. Poristic properties are geometrical results about the existence of geometrical configurations of figures that cannot exist unless a condition is met, but otherwise may exist in infinite number. Another classical example of a poristic property is the famous Poncelet's porism. Here, Baralic et al discuss several generalization of Steiner porism.