A handwriting instrument consists of a top part and a connected intermediate part, on the end of which a tip is fastened. One embodiment can interface a content delivery system and a content management system at the fragment level. The transmission member operates to transmit a rotation of the outer holder about the first axis to the wrist section, and to allow the wrist section to perform a rotational motion about a fourth rotation axis orthogonal to the third axis. A light waveguide disposed between the polarizer and the retarder layer reduces polarization changes between the polarizer and the retarder layer.