What is "saisen"

In Japanese, is money offered to the gods or bodhisattvas. Commonly this money is put in a , a common item at Shinto shrines and Buddhist temples in Japan.

Used to collect offerings, a saisen box is in essence a standard coin box, except that the top cover is a grate. This design allows coins to be tossed in, while still preventing the money to be retrieved easily. Those with better designs typically have grates made of round bars, or have their top surfaces act as a slope, allowing the money to slide into the box easily.