Life in Jar: the Irena Sendler Project Exhibit True stature of Irena Sendler. The project development by the students is also told in the exhibit. Student art work of Irena Sendler. Suitcase from the Jewish Quarters in Poland. Doctor’s bag from the Jewish Quarters in Poland. Replica of the apple tree that Irena buried the jars under. The jars buried under the apple tree were full of children’s names and covered with cheesecloth. Learn more about some of the children Irena saved.