This template is used to do something.
Type {{Layer/3x3|<param>}} somewhere.
{{Layer/3x3|<param>}}
{{Layer/3x3 |A1=Stone |A2=Block of Iron |A3=Stone |B1=Block of Iron |B2=Block of Gold |B3=Block of Iron |C1=Stone |C2=Block of Iron |C3=Stone}}
gives...