These weird tools include funnel glasses designed to guide eyedrops into the eye (see photo), a toilet tissue holder hat, and a barbed alarm clock intended to wake up its user quickly.

By model experiment, the parameters of slit holder are optimized turning to variance analysis theory of mathematical statistics in order to guide engineering project.

The invention relates to a projection-type head lamp capable of reinforcing light in a dark space, which comprises a lamp holder, an illuminating part, a shading plate and a light guide plate.