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The rise of twist-optics.

2D materials stacked with a relative twist angle have been the focus point of tremendous interest in the condensed matter community. In the last four months, a theoretical prediction and four independent experimental works, have demonstrated the tremendous interest these results can have for the nanophotonics community - the dispersion of twisted stacks of MoO3 crystals can range from hyperbolic to elliptic, depending on the twist angle and thicknesses. In this perspective we provide a fast introduction to this exciting new topic and explain the importance of these findings.