%
% global background lookup
%
% stack: backer
%
<
//Backgrounds
|1   "None"
|2   "Blank"
|3   "Canvas"
|4   "Cloth"
|5   "Flame"
|6   "Metal"
|7   "Sparks"
|8   "Stars"
|9   "Tree"
|10  "Water"
//Backgrounds
> not
{
 "Blank"
} if