diff --git a/gpu.h b/gpu.h
index 8fb4572..8dbb314 100644
--- a/gpu.h
+++ b/gpu.h
@@ -6,12 +6,11 @@
 
 #define SWAPCHAIN_IMG_BUFFER_SIZE 4
 
-typedef float vec2_t[3];
 typedef float vec3_t[3];
 typedef float mat4_t[16];
 
 typedef struct {
-	vec2_t position;
+	vec3_t position;
 	vec3_t colour;
 } vertex_t;
 
diff --git a/main.c b/main.c
index b372f9b..37a3c46 100644
--- a/main.c
+++ b/main.c
@@ -13,13 +13,15 @@
 #define H 600
 
 static const vertex_t vertices[] = {
-	{ { -1, -1 }, { 1, 0, 0 } },
-	{ { 1, -1 }, { 0, 1, 0 } },
-	{ { 1, 1 }, { 0, 0, 1 } },
-	{ { -1, 1 }, { 1, 1, 1 } },
+	{ { 0.000, 0.612, 0.000 }, { 1, 0, 0 } },
+	{ { -0.500, -0.204, -0.289 }, { 0, 1, 0 } },
+	{ { 0.500, -0.204, -0.289 }, { 0, 0, 1 } },
+	{ { 0.000, -0.204, 0.577 }, { 1, 1, 1 } },
 };
 
-static const uint16_t indices[] = { 0, 1, 2, 2, 3, 0 };
+static const uint16_t indices[] = {
+	0, 3, 1, 0, 1, 2, 0, 2, 3, 3, 2, 1,
+};
 
 typedef enum {
 	AXIS_X,
@@ -159,7 +161,7 @@ int main()
 	gpu_init(&gpu, &gpu_config);
 
 	mvp_t mvp = {
-		.model = ID,
+		.model = SCALE(2),
 		.view = TRANSLATE(0, 0, 4.0),
 	};
 	persp(mvp.proj, (float)W / H, M_PI / 6, 0.1, 10.0);
diff --git a/vert.glsl b/vert.glsl
index 1b02ecb..5839af9 100644
--- a/vert.glsl
+++ b/vert.glsl
@@ -1,6 +1,6 @@
 #version 450
 
-layout(location = 0) in vec2 pos;
+layout(location = 0) in vec3 pos;
 layout(location = 1) in vec3 colour;
 
 layout(location = 0) out vec3 frag_colour;
@@ -12,6 +12,6 @@ layout(push_constant) uniform MVP {
 } mvp;
 
 void main() {
-	gl_Position = mvp.proj * mvp.view * mvp.model * vec4(pos, 0.0, 1.0);
+	gl_Position = mvp.proj * mvp.view * mvp.model * vec4(pos, 1.0);
 	frag_colour = colour;
 }