An optical illusion apparently determines whether you're positive or prefer keep your distance – so what will you see when you look at the viral image shown here?

A tricky optical illusion has left so many people baffled, only a “true master of observation” is able to get to the bottom of it. Many people enjoy the intrigue of an optical illusion, or ...

Convex and concave, spherical and aspherical, one-side or double side microlens arrays and microlenses, hexagonal, square, orthogonal, rectagonal, circular, cylindrical, regular and irregular ...

Sener explained that the ancient death ray was made up of a series of large concave mirrors, positioned to focus the Sun’s rays onto a single focal point and potentially hitting a target up to ...