  In this paper we present the Australian Astronomical Observatory's concept
design for Sphinx - a fiber positioned with 4332 spines on a 7.77mm pitch for
CFHT's Mauna Kea Spectroscopic Explorer (MSE) Telescope. Based on the Echidna
technology used with FMOS (on Subaru) and 4MOST (on VISTA), the next evolution
of the tilting spine design delivers improved performance and superior
allocation efficiency. Several prototypes have been constructed that
demonstrate the suitability of the new design for MSE. Results of prototype
testing are presented, along with an analysis of the impact of tilting spines
on the overall survey efficiency. The Sphinx fiber positioned utilizes a novel
metrology system for spine position feedback. The metrology design and the
careful considerations required to achieve reliable, high accuracy measurements
of all fibres in a realistic telescope environment are also presented.
