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Over a decade of dedication in research in and technical-development for a high pressure apparatus capable of generating extensive shear at extreme pressures, a so called rotational anvil cell, we have reviewed much of its significance in high pressure science and technology as well as realized its great potential in scientific discoveries and in solving challenging problems.The present presentation tends to utilize as much results and new developments in this area to share such a vision and to draw sufficient attention of fellow scientists.In the application of shear on the hBN, we transformed it to wBN under a record low pressure of 7.1GPa, and revealed that shear is equivalent to temperature, bring about a new question that could lead to breakthrough in thermodynamics.In study of the phase relationship, we found that shear may not only reduce the transformation pressure of the alfa phase to the omega phase, but more importantly lead to the co-existence of the three phases and the lowest transition pressure of ~5GPa of the beta phase which is usually at 30GPa without shear.In exploration of the most common clay mineral, the water bearing layered-crystal,the montmorillonite, we introduce the capability and efficiency of shear dehydration and its profound meaning to the Earths interior.Along with the above and possibly more examples in the presentation is some technical development in a rotational apparatus, such as attaining over 60GPa with composite anvil of 1mm in diameter and techniques for synchrotron X-ray measurements of such apparatus.