This two-way screw is an optical illusion in mechanical form. A single shaft carries dual helix grooves where right-hand and left-hand threads overlap, and two nuts traverse those threads in completely opposite directions at once. Each piece arrives with its own colourway, but the movement is always the same.

Twist the shaft and watch the nuts glide back and forth along the spiral grooves. The right-hand nut climbs one way while the left-hand nut descends the other, creating a steady rhythm. You can twirl the shaft or flick the nuts directly, and the movement stays fluid either way. The whole setup works as a mind-bending visual trick that makes you stare longer than intended. Every rotation reveals the precision of the dual threading.

Set it on the desk and your fingers will find it. The back-and-forth glide gives your fingers something to do while your mind does something else entirely. Your colleagues will notice the movement and reach for it before you even realise they are doing so.