Have you ever known that your watch can be used as quite a good and
reliable compass? There is an easy way how to convert your working
indicator of time into a working indicator of direction.
Cover a big circle entirely
with the five smaller circles. But keep in mind: when a smaller circle is placed
on the big one you aren't allowed to move it anymore.
Sometimes when two solids are perfectly dovetailed together it looks
impossible to take them apart. It makes the question: is there still any
backward way or not?
A paper toy being classic for many years, but this time adapted for a
thumbtack theme. Of course, it's not a new standard for the thumbtacks -
just a new dimension.
