Math HorizonThis design was used on the cover of the MAA publication, Math Horizons, for which it was named. It is a projection of a twodimensional sphere in fourspace that has a single point of transverse selfintersection (though the projection introduces additional intersection along a line segment). Here, the projection is seen from a viewpoint that highlights its symmetry. The point at the center of the circles is the point of intersection in fourspace. The sphere is banded by circles of latitude, and alternate bands of the sphere have been removed. This image appeared as part of the art show Surfaces Beyond the Third Dimension.


