Visio Glue: Not For Sniffing
http://www.boxesandarrows.com/view/visio_glue_not_for_sniffing_special_deliverable_13

Brown, Dan
Boxes and Arrows
2005

Abstract:

Spend any time with Visio and you'll find yourself wondering how glue works. In the real world, it's pretty straightforward: put glue between two things and they'll stick. Although glue is used for sticking shapes together in Visio, the metaphor ends there.