diff --git a/parser/parser.lex b/parser/parser.lex
index d98b9f3..4eebffb 100644
--- a/parser/parser.lex
+++ b/parser/parser.lex
@@ -36,6 +36,7 @@ box                 return BOX;
 camera              return CAMERA;
 color               return COLOR;
 height              return HEIGHT;
+intersect           return INTERSECT;
 look_at             return LOOKAT;
 material            return MATERIAL;
 multisample         return MULTISAMPLE;
@@ -48,6 +49,8 @@ scene               return SCENE;
 shininess           return SHININESS;
 size                return SIZE;
 sphere              return SPHERE;
+subtract            return SUBTRACT;
+union               return UNION;
 up                  return UP;
 vfov                return VFOV;
 width               return WIDTH;
diff --git a/parser/parser.yy b/parser/parser.yy
index f00d991..c0b8d5a 100644
--- a/parser/parser.yy
+++ b/parser/parser.yy
@@ -55,6 +55,7 @@ int yywrap()
 %token CAMERA;
 %token COLOR;
 %token HEIGHT;
+%token INTERSECT;
 %token LOOKAT;
 %token MATERIAL;
 %token MULTISAMPLE;
@@ -67,6 +68,8 @@ int yywrap()
 %token SHININESS;
 %token SIZE;
 %token SPHERE;
+%token SUBTRACT;
+%token UNION;
 %token UP;
 %token VFOV;
 %token WIDTH;
@@ -77,6 +80,13 @@ scene: /* empty */
        | scene_spec { printf("Saw a scene\n"); }
        ;
 
+boolean_items: shape shape boolean_items_more
+             ;
+
+boolean_items_more: /* empty */
+                  | material boolean_items_more
+                  ;
+
 box: BOX LCURLY box_items RCURLY
    ;
 
@@ -97,6 +107,9 @@ camera_item: POSITION vector
            | VFOV vector
            ;
 
+intersect: INTERSECT LCURLY boolean_items RCURLY
+         ;
+
 material: MATERIAL LCURLY material_items RCURLY
         ;
 
@@ -134,6 +147,9 @@ scene_item: camera
 shape: plane
      | sphere
      | box
+     | union
+     | intersect
+     | subtract
      ;
 
 shape_items: /* empty */
@@ -147,6 +163,12 @@ sphere_items: shape_items
             | RADIUS number sphere_items
             ;
 
+subtract: SUBTRACT LCURLY boolean_items RCURLY
+        ;
+
+union: UNION LCURLY boolean_items RCURLY
+     ;
+
 vector: LESS number COMMA number COMMA number GREATER
       ;