Octadecagon Octadecagon An octadecagon (or octakaidecagon) or 18-gon is an eighteen-sided polygon. A "regular octadecagon" has a Schläfli symbol {18} and can be constructed as a quasiregular truncated enneagon, t{9}, which alternates two types of edges. As 18 = 2 × 3, a regular octadecagon cannot be constructed using a compass and straightedge. However, it is constructible using neusis, or an angle trisection with a tomahawk. The following approximate construction is very similar to that of the enneagon, as an octadecagon can be constructed as a truncated enneagon. It is also feasible with exclusive use of compass and straightedge. The "regular
How Many Clouds Can You See? a strange mixture of everything from free improvisation to calypso, his second date, 1970's "How Many Clouds Can You See?", is a much more focused affair. Surman clearly references one of his roots, John Coltrane, albeit on an instrument that the legendary saxophonist never played. All compositions by John Surman except where noted. How Many Clouds Can You See? How Many Clouds Can You See? is the second album by English saxophonist John Surman featuring Harry Beckett, Alan Skidmore, Barre Phillips and Tony Oxley recorded in 1970 and released on the Deram label. Allmusic awards the album 4 and a