diff --git a/src/fill/level.rs b/src/fill/level.rs
new file mode 100644
index 0000000..04da362
--- /dev/null
+++ b/src/fill/level.rs
@@ -0,0 +1,16 @@
+use crate::fill::FillMode;
+use crate::vec::Vector;
+
+pub struct LevelFillMode;
+
+impl LevelFillMode {
+    pub fn new() -> Self {
+        Self { }
+    }
+}
+
+impl FillMode for LevelFillMode {
+    fn sample(&self, level: f32, _: Vector) -> f32 {
+        level
+    }
+}
\ No newline at end of file
diff --git a/src/fill/mod.rs b/src/fill/mod.rs
new file mode 100644
index 0000000..2a6ecf9
--- /dev/null
+++ b/src/fill/mod.rs
@@ -0,0 +1,35 @@
+mod level;
+
+use clap::ArgEnum;
+use rand::prelude::IteratorRandom;
+use rand::Rng;
+use crate::fill::level::LevelFillMode;
+use crate::vec::Vector;
+
+pub trait FillMode {
+    fn sample(&self, level: f32, pos: Vector) -> f32;
+}
+
+#[derive(Copy, Clone, ArgEnum)]
+pub enum FillModeEnum {
+    Circle,
+    Level,
+    Stripe
+}
+
+pub fn choose_fill_mode(mut options: Vec<FillModeEnum>, rng: &mut impl Rng) -> FillModeEnum {
+    if options.is_empty() {
+        options.push(FillModeEnum::Circle);
+        options.push(FillModeEnum::Level);
+        options.push(FillModeEnum::Stripe);
+    }
+    options.into_iter().choose(rng).unwrap()
+}
+
+pub fn create_fill_mode(mode: FillModeEnum, _: Vector) -> Box<dyn FillMode> {
+    match mode {
+        FillModeEnum::Circle => todo!(),
+        FillModeEnum::Level => Box::new(LevelFillMode::new()),
+        FillModeEnum::Stripe => todo!()
+    }
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 2004c2c..455264d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,14 +1,19 @@
 use clap::Parser;
 use rand::rngs::OsRng;
 use crate::char::CharSampler;
+use crate::fill::FillModeEnum;
 use crate::pallet::{choose_pallet, create_pallet, PalletEnum};
 
 mod pallet;
 mod char;
+mod fill;
+mod vec;
 
 #[derive(Parser)]
 #[clap(author = "Rico Riedel", version = "0.1.0", about = "Wipe your terminal with a random animation.")]
 struct Args {
+    #[clap(short, long, help = "Add fill mode", arg_enum)]
+    fill: Vec<FillModeEnum>,
     #[clap(short, long, help = "Add color pallet", arg_enum)]
     pallet: Vec<PalletEnum>,
     #[clap(long, default_value = ".-+%#", help = "Set chars")]