Can a will be written on any surface?

We all know that a will must be written down, and most of us simply assume that means on regular sheets of paper. I personally have seen a will written on a series of small post-it notes, which was held by the court to be a valid will. On an earlier entry in this blog I told you about a woman who had written her will on a board. The attached article from http://www.allaboutestates.ca/ gives some pretty interesting examples of the surfaces used when a testator was in a pinch. Click here to read it.