Thus spake "Origami on behalf of Jorge E. Jaramillo" 
<[email protected]<mailto:[email protected]>
 on behalf of [email protected]<mailto:[email protected]>> on 8/29/20, 5:33 
PM:

Hi,

In Robert Lang's article about diagramming conventions that can be read at his 
webpage www.langorigami.com<http://www.langorigami.com> next to Figure 4, it 
reads "Crease lines should not contact the edges that the creases end upon. 
They do touch edges that they go under". Does anyone know a justification for 
this? I find it odd that creases should not be shown in their full extent.

The practice dates from the pen-and-ink days and low-res reproduction, where 
there was not much visual distinction between crease lines and folded edges. 
Leaving gaps at the end of crease lines makes clearer the distinction between a 
crease and a folded edge. It’s less necessary now that high-res displays and 
high-res printing can display clear distinction between (say) a 0.25pt crease 
line and a 1.0pt edge line.

Robert

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