diff --git a/crates/doc/src/selection.rs b/crates/doc/src/selection.rs
index 6400c3ad..a64b17aa 100644
--- a/crates/doc/src/selection.rs
+++ b/crates/doc/src/selection.rs
@@ -128,6 +128,20 @@ impl Selection {
         }
         self.target = Some(id);
     }
+    /// Shift-clicking `id`'s target circle: it (a layer: its art) joins the selection, or leaves it
+    /// when it is all selected already. Several objects are then selected, none targeted.
+    pub fn toggle_target(&mut self, doc: &Document, id: NodeId) {
+        let ids = match doc.node(id) {
+            Some(n) if n.is_layer() => n.layer_art(true),
+            _ => vec![id],
+        };
+        if ids.iter().all(|i| self.contains(*i)) {
+            ids.iter().for_each(|i| self.remove(*i));
+        } else {
+            ids.into_iter().for_each(|i| self.add(i));
+        }
+        self.target = None;
+    }
     /// What appearance and transparency edits act on: the targeted object, group or layer, else
     /// the selected objects.
     pub fn subjects(&self) -> &[NodeId] {
diff --git a/crates/engine/src/cmd/layer.rs b/crates/engine/src/cmd/layer.rs
index 2bae10ab..2d69434a 100644
--- a/crates/engine/src/cmd/layer.rs
+++ b/crates/engine/src/cmd/layer.rs
@@ -163,7 +163,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Target",
             [],
             None,
-            "{id} target a layer, group or object as clicking its target circle in the Layers panel does: a layer gets its visible, unlocked art (its sublayers' too) selected and becomes the current layer, and appearance.*, effect.*, transparency.* and the opacity-mask commands without `ids` then act on the layer itself; anything else is selected. Any other selection change ends the targeting (`document.inspect` → target) → {id, selected: [..]}",
+            "{id, add?: bool (Shift-click: the item joins the selection, or leaves it when all selected; nothing is targeted)} target a layer, group or object as clicking its target circle in the Layers panel does: a layer gets its visible, unlocked art (its sublayers' too) selected and becomes the current layer, and appearance.*, effect.*, transparency.* and the opacity-mask commands without `ids` then act on the layer itself; anything else is selected. Any other selection change ends the targeting (`document.inspect` → target) → {id, selected: [..]}",
             has_doc,
             target
         ),
@@ -362,7 +362,11 @@ fn target(s: &mut Session, p: &Value) -> Result<Value> {
     }
     let layer = n.is_layer();
     let rows = st.layer_rows.clone();
-    s.select(|d, sel| sel.set_target(d, id))?;
+    if p.get("add").and_then(Value::as_bool).unwrap_or(false) {
+        s.select(|d, sel| sel.toggle_target(d, id))?;
+    } else {
+        s.select(|d, sel| sel.set_target(d, id))?;
+    }
     let st = s.doc_mut()?;
     // Targeting doesn't change which rows are highlighted.
     st.layer_rows = rows;
diff --git a/crates/ui-egui/src/panels/layers.rs b/crates/ui-egui/src/panels/layers.rs
index 51a30339..87c6a0fc 100644
--- a/crates/ui-egui/src/panels/layers.rs
+++ b/crates/ui-egui/src/panels/layers.rs
@@ -664,7 +664,7 @@ fn row(ui: &mut Ui, view: &View, item: &Row, out: &mut Out) {
     }
     let m = ui.input(|i| i.modifiers);
     if tresp.clicked() {
-        out.actions.push(("layer.target".into(), json!({"id": n.id.0})));
+        out.actions.push(("layer.target".into(), json!({"id": n.id.0, "add": m.shift})));
     } else if sq_resp.clicked() {
         out.actions.push(("layer.selectAll".into(), json!({"id": n.id.0, "add": m.shift})));
     } else if resp.clicked() {
@@ -1239,6 +1239,13 @@ mod tests {
         }
         let st = app.session.active().unwrap();
         assert_eq!((st.selection.target, st.selection.objects.clone()), (Some(a), vec![a]));
+        // Shift-clicking another object's circle adds it to the selection (#901), and again takes
+        // it out; nothing is targeted meanwhile.
+        click_with(&mut app, &ctx, c[1], egui::Modifiers::SHIFT);
+        let st = app.session.active().unwrap();
+        assert_eq!((st.selection.target, st.selection.objects.clone()), (None, vec![a, b]));
+        click_with(&mut app, &ctx, c[1], egui::Modifiers::SHIFT);
+        assert_eq!(app.session.active().unwrap().selection.objects, vec![a]);
     }
 
     #[test]