diff --git a/elements/window.go b/elements/window.go
index 7b432c3..83b2f79 100644
--- a/elements/window.go
+++ b/elements/window.go
@@ -1,13 +1,13 @@
 package elements
 
+import "io"
 import "image"
+import "git.tebibyte.media/sashakoshka/tomo/data"
 
 // Window represents a top-level container generated by the currently running
 // backend. It can contain a single element. It is hidden by default, and must
 // be explicitly shown with the Show() method.
 type Window interface {
-	Parent
-
 	// Adopt sets the root element of the window. There can only be one of
 	// these at one time.
 	Adopt (Element)
@@ -27,6 +27,15 @@ type Window interface {
 
 	// NewModal creates a new modal dialog window.
 	NewModal (width, height int) (window Window, err error)
+	
+	// Copy puts data into the clipboard.
+	Copy (data.Data)
+
+	// Paste requests the data currently in the clipboard. When the data is
+	// available, it is sent on the returned channel. If there is no data on
+	// the clipboard matching the requested mime type, the channel will be
+	// sent nil.
+	Paste (accept data.Mime) <- chan io.Reader
 
 	// Show shows the window. The window starts off hidden, so this must be
 	// called after initial setup to make sure it is visible.
diff --git a/tomo.go b/tomo.go
index eb36c8e..33780cb 100644
--- a/tomo.go
+++ b/tomo.go
@@ -4,7 +4,6 @@ import "os"
 import "io"
 import "path/filepath"
 import "git.tebibyte.media/sashakoshka/tomo/dirs"
-import "git.tebibyte.media/sashakoshka/tomo/data"
 import "git.tebibyte.media/sashakoshka/tomo/theme"
 import "git.tebibyte.media/sashakoshka/tomo/config"
 import "git.tebibyte.media/sashakoshka/tomo/elements"
@@ -47,19 +46,6 @@ func NewWindow (width, height int) (window elements.MainWindow, err error) {
 	return backend.NewWindow(width, height)
 }
 
-// Copy puts data into the clipboard.
-func Copy (data data.Data) {
-	assertBackend()
-	backend.Copy(data)
-}
-
-// Paste returns the data currently in the clipboard. This method may
-// return nil.
-func Paste (accept []data.Mime) (data.Data) {
-	assertBackend()
-	return backend.Paste(accept)
-}
-
 // SetTheme sets the theme of all open windows.
 func SetTheme (theme theme.Theme) {
 	backend.SetTheme(theme)