18x24 inch poster over craftsmanship inside the classroom. I refer to it to help students realize that they don't need to be great artists in order to do quality work. The colored in picture is of a plant cell.
This is just the png file for the poster. You will need to print it out using a large scale printer. Some schools have their own large scale printers but I usually upload and order my files to office depot and print on 55 lb paper because I prefer the quality of their prints.