Preheat oven to 250°F.
Measure and mix the flour, salt and cinnamon together.
Add the water and mix. Once a dough starts to form, kneed until firm and well mixed. This will take a few minutes.
Sprinkle some extra flour onto a clean countertop and onto a rolling pin. Roll dough until it is 1/4-1/3" thick.
Decide what types of shapes or imprints you could like to create. If using cookie cutters for shapes, cut out shapes. If creating imprints of hands or feet, firmly place into dough until imprint is visible to at least several millimeters deep. Use a circular item or knife to cut around imprint as desired. Smooth edges.
If creating an ornament or desire to hang the salt dough, punch a hole in the dough prior to baking. Metal straws are a perfect tool for this.
Place onto silicone mat lined baking sheet, with imprint or best side facing up.
Bake for 1.5 hours.
Flip dough and bake for another 1.5 hours.
Leave out to continue to dry overnight at minimum prior to decorating.
Decorate or leave simple as desired.