Aztec whistles of death are skull-shaped whistles that emit an eerie shriek when blown into. Hundreds had been collected and dismissed as toys, until Roberto Velazquez, a mechanical engineer who has devoted his adult life to researching and recreating the sounds of ancient whistles, brought attention to the cultural significance of the whistles. Aztec whistles of death are classified as a member of the aerophone family because the sound is produced by air vibrating within the instrument.
Shape the Sculpey terracotta clay into a small palm-sized ball by rolling it between your hands. Squeeze the ball gently with your fingers on the sides to flatten and elongate the ball slightly.
Roll a separate tube of clay that is about 2 to 3 inches in length and 1/2 inch in diameter. Attach the tube to the top of the ball of clay by gently pressing and smoothing the edges of the tube into the top of the ball.
Insert the clay shaper into the tube slowly until it goes into the centre of the ball. Slowly extract the shaper. Make a large hole at the bottom of the ball and hollow out the inside using the bullnose texturing/sculpting tool.
Make another smaller ball of clay by rolling it between your hands. This ball should be small enough to fit inside the larger ball with excess space around it. Cut this ball in half using the sculpting wire. Hollow out the inside of both halves of this smaller ball with the bullnose tool.
Fit the two halves together loosely and poke a hole in the top with the taper tool. Open the ball up again and clean up any loose clay. Fit the ball back together and smooth the seam gently, creating a hollowed-out ball with a hole at the top.
Insert the hollowed-out ball into the larger one. Line up the hole of the hollow ball with the hole from the tube on the larger ball. Leave a small gap between the tube hole and the hollow ball. Affix the smaller ball inside the larger one by smoothing the edges of clay together.
Sculpt the face of the larger ball to resemble a skull using the bullnose tool and the toothpicks to define shapes and create relief.
Preheat oven to the temperature specified on the Sculpey package. Place whistle on the baking tray. Bake for the amount of time specified on the package. Allow to cool completely.
Paint the finished whistle with the paints and paintbrushes.
Moisten the clay with the spray bottle filled with water if it begins to become difficult to work with. Make sure the hole leading up the tube is clear of loose pieces of clay. More clay may need to be added or used as a patch to fuse pieces together or fix holes.
Be gentle when handling the hollowed-out clay, it may want to "deflate" if handled roughly. Keep clay moist until it is baked to avoid cracks from forming. Do not overbake.