diff --git a/Cargo.lock b/Cargo.lock
index 83b4e76..9d19b0b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2295,14 +2295,6 @@ dependencies = [
  "smithay-client-toolkit 0.6.6",
 ]
 
-[[package]]
-name = "spircles"
-version = "0.1.0"
-dependencies = [
- "nannou",
- "utils",
-]
-
 [[package]]
 name = "spirv_cross"
 version = "0.23.1"
@@ -2348,6 +2340,14 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
 
+[[package]]
+name = "subtitled1"
+version = "0.1.0"
+dependencies = [
+ "nannou",
+ "utils",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.74"
diff --git a/README.md b/README.md
index b810861..af5ba70 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,4 @@ this is a bunch of nannou projects
 
 ## list
 
-- spircles: some spinning circles
+- subtitled #1: some spinning circles
diff --git a/crates/spircles/Cargo.toml b/crates/subtitled1/Cargo.toml
similarity index 84%
rename from crates/spircles/Cargo.toml
rename to crates/subtitled1/Cargo.toml
index 962360b..d972543 100644
--- a/crates/spircles/Cargo.toml
+++ b/crates/subtitled1/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "spircles"
+name = "subtitled1"
 version = "0.1.0"
 edition = "2018"
 
diff --git a/crates/spircles/src/main.rs b/crates/subtitled1/src/main.rs
similarity index 97%
rename from crates/spircles/src/main.rs
rename to crates/subtitled1/src/main.rs
index a8f4202..a5c66b8 100644
--- a/crates/spircles/src/main.rs
+++ b/crates/subtitled1/src/main.rs
@@ -1,7 +1,6 @@
 use nannou::prelude::*;
 
 use utils::color::color;
-use utils::record::record;
 
 fn main() {
     nannou::app(model).update(update).simple_window(view).run();
@@ -77,5 +76,5 @@ fn view(app: &App, _model: &Model, frame: Frame) {
 
     draw.to_frame(app, &frame).unwrap();
 
-    record(app, &frame);
+    utils::record::record(app, &frame);
 }
diff --git a/crates/utils/src/lib.rs b/crates/utils/src/lib.rs
index 9376efc..5abbf1f 100644
--- a/crates/utils/src/lib.rs
+++ b/crates/utils/src/lib.rs
@@ -1,2 +1,18 @@
 pub mod color;
 pub mod record;
+
+use nannou::prelude::*;
+
+/// Maps the sine of v to (out_min, out_max)
+pub fn map_sin(v: f32, out_min: f32, out_max: f32) -> f32 {
+    map_range(v.sin(), -1.0, 1.0, out_min, out_max)
+}
+
+pub trait Vec2Extension {
+    fn atan2(self) -> f32;
+}
+impl Vec2Extension for Vec2 {
+    fn atan2(self) -> f32 {
+        self.x.atan2(self.y)
+    }
+}