A lockbox opens when a magnet is moved across its surface in a programmed pattern, with no visible keyhole or keypad. An 8-by-8 array of 64 magnetic sensors tracks the motion; when the gesture matches the stored pattern, a servo releases the latch.

Creator Stephen Cass found that the sensor area was only about three centimeters square, making it difficult to trace the gesture reliably. He decorated the box with a Celtic knot pattern and used part of it as a disguised positioning guide.

A glove-controlled tracked robot responds to a raised middle finger by raising its own mechanical finger. The maker says the build uses two Arduino Nano boards, a motion sensor in the glove, four drive motors and a servo for the finger.

The project was shared in a maker's Reddit post.