Protofy – The art of Prototyping

“Why are Manhole covers round?” asked the man on the phone, err umm…because they are easy to get in I pleaded. A classical question but the answers are many. I probably surprised him by the lack of choice.

 Wikipedia has a page dedicated to this and apparently my answer features there somewhere too…but the most appealing one to me was that Manhole covers are easy to align” forget aligning the squares and the triangles.

 Interesting…