Last week I decided to give a lesson on the Phases of the Moon, to introduce the lunar calendar to our students. My Montessori training program included masters for all the phases of the moon. I copied, cut out and colored lightly each phase and pasted it to a darker outline of the moon. Last spring I attempted to make this same material, but I failed to superimpose the moon phase onto the dark gray moon outline. My instructors corrected me, explaining how the gray outline is necessary in order to give a more realistic dipiction of the shape of the moon and how the shape of the moon remains constant, but the light relfected is what changes.
Here is the final product which I used to give my lesson last week. I also provided a work board, wherein the students match the name of the phase with the moon phase itself.