diff --git a/crates/utils/src/curves.rs b/crates/utils/src/curves.rs
new file mode 100644
index 0000000..69d59e8
--- /dev/null
+++ b/crates/utils/src/curves.rs
@@ -0,0 +1,31 @@
+use nannou::prelude::*;
+
+pub struct Chaikin {
+    pub points: Vec<Vec2>,
+}
+impl Chaikin {
+    pub fn new(points: Vec<Vec2>) -> Self {
+        Self { points }
+    }
+
+    pub fn points(&self, div: f32, n: usize) -> Vec<Vec2> {
+        let mut points = self.points.clone();
+        for _ in 0..n {
+            let first = *points.first().unwrap();
+            let last = *points.last().unwrap();
+            points = points
+                .windows(2)
+                .flat_map(|p| {
+                    let a = p[0];
+                    let b = p[1];
+
+                    [a + div * (b - a), a + (1.0 - div) * (b - a)]
+                })
+                .collect();
+
+            points.insert(0, first);
+            points.push(last);
+        }
+        points
+    }
+}
diff --git a/crates/utils/src/lib.rs b/crates/utils/src/lib.rs
index 0785886..9e6305f 100644
--- a/crates/utils/src/lib.rs
+++ b/crates/utils/src/lib.rs
@@ -1,4 +1,5 @@
 pub mod color;
+pub mod curves;
 pub mod drawing;
 pub mod record;
 pub mod sequences;
@@ -49,3 +50,7 @@ pub fn vec2_range(min: f32, max: f32) -> Vec2 {
 pub fn ivec2_range(min: i32, max: i32) -> IVec2 {
     ivec2(random_range(min, max), random_range(min, max))
 }
+/// returns a random vector in the unit circle
+pub fn vec2_circ() -> Vec2 {
+    random_range(0., TAU).sin_cos().into()
+}
diff --git a/record.sh b/record.sh
index 09280e5..0a40d44 100755
--- a/record.sh
+++ b/record.sh
@@ -8,6 +8,7 @@ if [[ -z $1 ]]; then
   echo -e "\t$0 packagename"
 else
   rm -rf "recordings/$1/frames"
+  mkdir -p "recordings/$1/videos"
   cargo run --release --package $1 -- -record
   filename="video$(( $(find recordings/$1/videos -type f -exec basename -s .mp4 {} \; | sed 's/^video//' | sort -n | tail -n1) + 1)).mp4"
   ffmpeg -framerate 60 -i "recordings/$1/frames/%03d.png" -pix_fmt yuv420p "recordings/$1/videos/$filename"