The base tomo module only retains a singleton backend

entity.go

@@ -1,7 +1,7 @@
 package tomo
 
 import "image"
-import "git.tebibyte.media/sashakoshka/tomo/canvas"
+import "git.tebibyte.media/sashakoshka/tomo/artist"
 
 // Entity is a handle given to elements by the backend. Extended entity
 // interfaces are defined in the ability module.
@@ -28,5 +28,5 @@ type Entity interface {
 	// labels. If there is no parent element (that is, the element is
 	// directly inside of the window), the backend will draw a default
 	// background pattern.
-	DrawBackground (canvas.Canvas)
+	DrawBackground (artist.Canvas)
 }