The box!

Myrtle and Malachi are hiding in this box. (Myrtle because she's a turtle and Malachi because it means 'messenger'. Malachi is on a folded spring and leaps up as a proper 'jack in a box' should. Myrtle refused to do this unless she had a proper custom designed conical spring. As this was too expensive to buy and beyond my engineering capacities to make, she is tensioned instead with elastic. She holds Malachi down with her head when the box is closed and her head emerges when the box shell opens - like a turtle would and releases Malachi who gives his message.

Myrtle hanging out with Malachi