Many publicly funded museums and art galleries around the world ask for a certain "suggested donation" in exchange for admission. Patrons are almost never supervised during their donations, so there is no way of making sure the suggested minimum is being paid. Strictly speaking this is not an honor system, as no payment obligation actually exists (merely a suggested donation); a true honor system is one in which there is an obligation, but it is not enforced. However, these "suggested donation" schemes are often regarded as similar to an honor system, because they rely on the goodwill of patrons rather than the force of law.