It struck me that it would be a good idea to demonstrate that it is indeed possible to write extremely small letters and that they can be inserted into other letters and markings on a document.
Here are a couple of examples:
This first image is of the alphabet, the letters within it range between .25 mm and .4 mm in height.
This image is of the Lords Prayer, again the letter size is in the same range as before and here you can see how a fair amount of information can be compressed into a small space. In this case it's the prayer but it could equally be a set of code numbers or letters for example.
Just time for this quick post, there will be more examples to come in the next few days including a classic one of a Postcard that I believe will be very interesting.