A sheathed yarn having a natural appearance comprises a core yarn and a sheath which is made from a thermoplastic material. The thermoplastic material of the sheath comprises less than 20 wt.-% of staple fibers, especially of natural origin. The sheathed yarn exhibits excellent mechanical properties and usage properties such as fire resistance, weatherability, resistance to sunshine, and an external appearance generating physically pleasant visual, tactile and olfactory sensations.

A MEMS device is provided which includes a driven element having a series of teeth. The MEMS device includes a driving element operable to engage the driven element when the driving element is in a meshed position with the series of teeth. A driving actuator of the MEMS device is operable to (i) move the driving element with a hysteresis-type motion from an initial position into the meshed position to engage the driven element, (ii) move the driving element causing the driven element to move whi...