pin 11 is located at the center of each hexagonal assembly 50 and so each of the six bodies 15 surrounding that pin 11 may be latched thereon in order to be maintained at its upper shed position complete hexagonal assemblies 50 are not formed at the periphery of the tessellated assembly similarly internally of the tessellated assembly each pin 12 and each pin 13 is surrounded by six selector bodies 15 accordingly during any weaving cycle each selector body 15 may be independently latched on to an associated pin 11 12 or 13 so as to be independently moved between upper and lower shed positions or retained at these positions as more clearly seen in fig4 each selector body 15 preferably comprises a lower body portion 51 which is spaced from and secured to an upper body portion 52 by a series of struts 54 the upper and lower body portions 51 52 are preferably moulded from a suitable plastics material and are each of triangular cross section a groove 55 is located at the apex of each body portion 51 52 for sliding engagement with associated pins 11 12 and 13 the interconnecting struts may be formed from a suitable plastics material or metal each latch 18 19 and 20 is mounted on an upper end of a deflectable elongate support 60 the support 60 is mounted at its lower end on the lower body portion 15 an electrostrictive or piezo electric strip 62 is associated with the support 60 to cause the upper end of the support 60 to be deflected.