There were 13 treasuries in the courtyard...each one bearing a letter that signified the purpose of that particular treasury. Each one was shaped like a tall box with a trumpet...a large cone coming out of it... When someone would toss their money into it, it was possible to make the coins roll around and be heard all over the temple. Some people would bring their entire offering in copper coins so that they could throw it in and everyone would notice their giving. It was an announcement. Jesus sat ans watched these people as they walked by dropping their coins into the boxes. Apparently this matter of giving meant a great deal to Jesus.