“This says that the most stable arrangement is a pentagon surrounded by five hexagons.”

“Similarly, nine atoms can form a pentagon bonded to a hexagon, each ring sharing two atoms with the other ring.”

“How much more sacred than our triangle would be a square, a pentagon, a decagon, a figure with a hundred sides?”

“For example, Angel consists of three layers of open triangles, trapezoids, parallelograms and pentagons, once again made of wood.”

“It is composed of pentagons and hexagons of carbon atoms arranged in a sphere, just like a football.”

“Figure 33 shows a tessellation of the hyperbolic disc by regular pentagons.”