diff --git a/template_sketch.js b/template_sketch.js
new file mode 100644
index 0000000..a988f3d
--- /dev/null
+++ b/template_sketch.js
@@ -0,0 +1,197 @@
+const vec = p5.Vector;
+
+class Leg {
+  constructor() {
+    this.base = new vec(0, 0);
+    this.end = new vec(0, 0);
+    this.interPos = new vec(0, 0);
+    this.ikJoint = new IKJoint(8, 8);
+    this.repositionDist = 50;
+    this.moveSpeed = 0.4;
+  }
+
+  moveTo(startX, startY, endX, endY) {
+    // mover final de pierna cuando quede esta fuera del rango
+  }
+
+  getPoints() {
+    return this.ikJoint.points;
+  }
+}
+
+class IKJoint {
+  constructor(numSegments, pointDist) {
+    this.origin = new vec(0, 0);
+    this.points = [];
+    for (let i = 0; i < numSegments + 1; i++) {
+      this.points.push(new ConstraintPoint(0, 0, pointDist, 0.5));
+    }
+    this.pointDist = pointDist;
+    this.iterations = 20;
+  }
+
+  moveStart(targetX, targetY) {
+    // empezar a mover desde el punto 0
+  }
+
+  moveEnd(targetX, targetY) {
+    // empezar a mover desde el punto final
+  }
+
+  moveTo(origX, origY, targetX, targetY) {
+    // alternar movimientos
+    for (let i = 0; i < this.iterations; i++) {
+      this.moveEnd(targetX, targetY);
+      this.moveStart(origX, origY);
+    }
+  }
+}
+
+class ConstraintPoint {
+  constructor(x, y, size, angleConstraint = 0.2) {
+    this.size = size;
+    this.pos = new vec(x, y);
+    this.forward = new vec(0, 0);
+    this.angleConstraint = angleConstraint;
+  }
+
+  getRel(angleOffset, dist) {
+    // devolver vector relativo al punto con un angulo y distancia, completar
+    return this.pos;
+  }
+
+  follow(targetX, targetY, parentForward = null) {
+    // mover punto dentro de los constraints, completar
+    let target = new vec(targetX, targetY);
+
+    if (parentForward) {
+      // si tenemos punto anterior, limitar angulos, completar
+    }
+
+    // asignar sigiente forward, completar
+    this.forward = null;
+
+    this.pos = target;
+  }
+}
+
+function drawPoints(points, sizes, turnSegments = 10) {
+  beginShape();
+  // dibujar vertice, completar
+
+  let numPoints = points.length;
+  let head = points[0];
+  let tail = points[numPoints - 1];
+  // debug
+  push()
+  noFill();
+  for (let i = 0; i < numPoints;i++) {
+    circle(head.pos.x, head.pos.y, sizes[i] * 2);
+  }
+  pop()
+
+  endShape(CLOSE);
+
+}
+
+function drawGills(basePoint, sign) {
+  push();
+  // dibujar forma de branquias, completar
+
+  pop();
+}
+
+let numPoints = 0;
+const bodySizes = [60, 55, 50, 40, 45, 47, 50, 47, 45, 42, 39, 35, 30, 25, 22, 17, 13];
+const legSizes = Array.from({ length: 20 }, () => 15);
+const bodyPoints = [];
+const leg1 = new Leg();
+const leg2 = new Leg();
+const leg3 = new Leg();
+const leg4 = new Leg();
+let mouseInter = new vec(0, 0);
+let baseColor;
+let gillColor;
+let lastBlinkTime = 0;
+let nextBlinkDelay = 3000;
+let blinkDuration = 150;
+
+function setup() {
+  createCanvas(displayWidth, displayHeight);
+  numPoints = bodySizes.length;
+  for (let i = 0; i < numPoints; i++) {
+    let pt = new ConstraintPoint(400, 400, 20);
+    bodyPoints.push(pt);
+  }
+  baseColor = color(249, 182, 249)
+  gillColor = color(243, 158, 189)
+}
+
+function draw() {
+  background(150);
+
+  mouseInter.lerp(new vec(mouseX, mouseY), 0.01);
+  let time = millis();
+
+  // fisica
+  bodyPoints[0].follow(mouseInter.x, mouseInter.y);
+
+  for (let i = 1; i < numPoints; i++) {
+    let prevPoint = bodyPoints[i - 1];
+    bodyPoints[i].follow(prevPoint.pos.x, prevPoint.pos.y, prevPoint.forward);
+
+    let tailStart = Math.floor(numPoints / 2);
+  }
+  let legEndDist = 70;
+  let baseJointL1 = bodyPoints[2];
+  let baseL1 = baseJointL1.getRel(-HALF_PI, 30);
+  let endL1 = baseJointL1.getRel(-HALF_PI, legEndDist);
+  let baseR1 = baseJointL1.getRel(HALF_PI, 30);
+  let endR1 = baseJointL1.getRel(HALF_PI, legEndDist);
+
+  let baseJointL2 = bodyPoints[6];
+  let baseL2 = baseJointL2.getRel(-HALF_PI, 30);
+  let endL2 = baseJointL2.getRel(-HALF_PI, legEndDist);
+  let baseR2 = baseJointL2.getRel(HALF_PI, 30);
+  let endR2 = baseJointL2.getRel(HALF_PI, legEndDist);
+
+  leg1.moveTo(baseL1.x, baseL1.y, endL1.x, endL1.y);
+  leg2.moveTo(baseR1.x, baseR1.y, endR1.x, endR1.y);
+  leg3.moveTo(baseL2.x, baseL2.y, endL2.x, endL2.y);
+  leg4.moveTo(baseR2.x, baseR2.y, endR2.x, endR2.y);
+
+  // dibujar
+  fill(baseColor);
+  stroke(0);
+  strokeWeight(2);
+
+  drawPoints(leg1.getPoints(), legSizes);
+  drawPoints(leg2.getPoints(), legSizes);
+  drawPoints(leg3.getPoints(), legSizes);
+  drawPoints(leg4.getPoints(), legSizes);
+
+  let currentBodySizes = [...bodySizes];
+
+  // animacion de respirar, completar
+
+  drawPoints(bodyPoints, currentBodySizes);
+
+  // dibujar aleta, completar
+  let p1 = bodyPoints[4].pos;
+  let p2 = bodyPoints[6].pos;
+  let p3 = bodyPoints[8].pos;
+  let p4 = bodyPoints[10].pos;
+
+  drawGills(bodyPoints[2], 1);
+  drawGills(bodyPoints[2], -1);
+
+  let eye1 = bodyPoints[0].getRel(HALF_PI / 2, 45);
+  let eye2 = bodyPoints[0].getRel(-HALF_PI / 2, 45);
+
+  push();
+  fill(0);
+  noStroke();
+  circle(eye1.x, eye1.y, 12);
+  circle(eye2.x, eye2.y, 12);
+  pop();
+}