No. 200. Key-Pattern Borders.
No. 201. Interlacing Borders.
The well-known key-border is a continuous narrow band or line which traces out a labyrinth pattern by bending inwards at right angles and then returning to the original direction. This, in its simplest form, is an elaboration of adjacent squares in which a top and bottom line is alternately dispensed with.
Geometric Elements
The simplest elements in border decoration are geometric in character. The border may be divided by straight lines intersecting at various angles, or by curves struck from equidistant centres, or by a combination of straight lines and curves.