A barrel of terumah concerning which there arose a question of tumah, R' Eliezer says: If it was located in a neglected place, he should put it in a protected place; if it was exposed, he should cover it. But R' Yehoshua says: If it was located in a protected place, he puts it in a neglected place; if it was covered, he uncovers it. Rabban Gamliel says: He should not make any innovations with it.