diff --git a/app/src/routes/test/+page.svelte b/app/src/routes/test/+page.svelte
index c996da0..e457072 100644
--- a/app/src/routes/test/+page.svelte
+++ b/app/src/routes/test/+page.svelte
@@ -1,15 +1,16 @@
 <script lang="ts">
   import { decode, encode } from "$lib/helpers/flat_tree";
 
-  const input = [5, [6, 1], [7, 2, [5, 1]]];
+  // const input = [5, [6, 1], [7, 2, [5, 1]]];
   // const input = [5, [], [6, []], []];
   // const input = [52];
+  const input = [0, 0, [0, 2, 0, 128, 0, 128], 0, 128];
 
   console.log("INPUT");
   console.log(input);
 
   let encoded = encode(input);
-  encoded = [0, 3, 5, ...encoded.slice(2).slice(0, -4), 5, 5, 1, 1];
+  // encoded = [];
   console.log("ENCODED");
   console.log(encoded);
 
diff --git a/packages/node-registry/src/index.test.ts b/packages/node-registry/src/index.test.ts
deleted file mode 100644
index e07cbbd..0000000
--- a/packages/node-registry/src/index.test.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { describe, it, expect } from 'vitest';
-
-describe('sum test', () => {
-	it('adds 1 + 2 to equal 3', () => {
-		expect(1 + 2).toBe(3);
-	});
-});
diff --git a/packages/plantarium/src/lib.rs b/packages/plantarium/src/lib.rs
index 197c101..58e313e 100644
--- a/packages/plantarium/src/lib.rs
+++ b/packages/plantarium/src/lib.rs
@@ -1,4 +1,6 @@
+mod encoding;
 mod helpers;
+mod nodes;
 mod tree;
 pub use helpers::*;
 pub use tree::*;
diff --git a/packages/plantarium/src/nodes.rs b/packages/plantarium/src/nodes.rs
new file mode 100644
index 0000000..d69beee
--- /dev/null
+++ b/packages/plantarium/src/nodes.rs
@@ -0,0 +1,18 @@
+use crate::encoding;
+
+pub fn math_node(args: &[i32]) -> (i32, i32) {
+    let math_type = args[0];
+
+    let a = encoding::decode_float(args[1], args[2]);
+    let b = encoding::decode_float(args[3], args[4]);
+
+    let result = match math_type {
+        0 => a + b,
+        1 => a - b,
+        2 => a * b,
+        3 => a / b,
+        _ => 0.0,
+    };
+
+    encoding::encode_float(result)
+}
diff --git a/packages/plantarium/src/tree.rs b/packages/plantarium/src/tree.rs
index 59c9afc..322bd13 100644
--- a/packages/plantarium/src/tree.rs
+++ b/packages/plantarium/src/tree.rs
@@ -1,4 +1,4 @@
-pub fn get_args<'a>(args: &'a Vec<i32>) -> Vec<&[i32]> {
+pub fn get_args(args: &[i32]) -> Vec<&[i32]> {
     let mut idx: usize = 0;
     let mut depth = -1;
 
@@ -57,13 +57,60 @@ pub fn get_args<'a>(args: &'a Vec<i32>) -> Vec<&[i32]> {
         arg_start_index = idx;
     }
 
-    return out_args;
+    out_args
+}
+
+pub fn evaluate_node(input_args: &[i32]) -> (i32, i32) {
+    let node_type = input_args[0];
+
+    match node_type {
+        0 => crate::nodes::math_node(&input_args[1..]),
+        _ => (0, 0),
+    }
+}
+
+pub fn evaluate_args(input_args: &[i32]) -> (i32, i32) {
+    let args = get_args(input_args);
+
+    let mut resolved: Vec<i32> = Vec::new();
+
+    for arg in args {
+        if arg.len() == 1 {
+            resolved.push(arg[0]);
+        } else {
+            let res = evaluate_args(arg);
+            resolved.push(res.0);
+            resolved.push(res.1);
+        }
+    }
+
+    if resolved.len() > 1 {
+        evaluate_node(&resolved)
+    } else {
+        (resolved[0], resolved[1])
+    }
 }
 
 #[cfg(test)]
 mod tests {
+
+    use crate::encoding::decode_float;
+
     use super::*;
 
+    #[test]
+    fn test_resursive_evaluation() {
+        let input = vec![0, 3, 0, 0, 0, 7, 0, 2, 0, 128, 0, 128, 1, 6, 0, 128];
+        // this is an encoded version of a math node that multiplies 2 * 2
+        // and another math node that adds 2 to that result
+        // the numbers are f32 floats encoded as two i32's
+
+        let result = evaluate_args(&input);
+        let decoded = decode_float(result.0, result.1);
+
+        assert_eq!(decoded, 6.0);
+    }
+
     #[test]
     fn test_example_input_a() {
         let input_a = vec![0, 4, 1, 2, 3, 0, 7, 1, 2, 4, 2, 4, 1, 1, 1, 1];