If it's a picture of the same picture then it's known as the Droste effect. But a more generic for this is just a recursive picture.
it is a math graph that can be used for sales or to show a record of anything.
No, not "population". I'm not a good source, but I'm pretty sure it shows 'How Data Relates to other Data.' Is that ok?-S. FS.
Picture graphs are graphs that use pictures to convey data points. Like any graph or picture, they can be helpful as people remember visual images longer than the written word.
You could go on graphing pictures and you will see all kinds of pictures you could do.