Also I want to add, you can move the square ones around in your editor as long as there is space above or below a code window you may have going.
Update: come to think, you can move the attachments inserted into post as well. They will be in square block attachment tags with a number, you can cut and paste or delete in the editor.
Update: come to think, you can move the attachments inserted into post as well. They will be in square block attachment tags with a number, you can cut and paste or delete in the editor.
b = b + ...