Academy da Vinci Clock

Leonardo da Vinci Catapult Kit

Pathfinders Leonardo da Vinci Premium Aerial Screw (Helicopter Flying Machine) Wood Model Kit

Toysmith Euler's Disk

Academy Da Vinci Machines Series Flying Pendulum Clock - #18157

Da Vinci Rolling Ball Timer - Da Vinci Machines Series Kit by Academy #18174

Willcomes Wooden Turns Itself Off Useless Box Leave Me Alone Box Perpetual Machine for Geek Gifts or Desk Toys

5" Sundial Compass Solid Brass Sun Dial

Abong Ballista Wooden Miniature Tabletop Desktop Warfare Kit - Easy Assembly and Reliable Performance - with Detailed, Full-Color Instruction Guide - 28 Pieces STEM Model Kit

Pathfinders Leonardo Davinci Ornithopter Wood Kit

Edu-Toys Leonardo Da Vinci Paddle Boat