The CRC/TRR 173 Spin+X combines the expertise of physics and chemistry to investigate spin phenomena, ranging from microscopic properties to emergent and functional spin phenomena and their coupling to the macroscopic world. Using state-of-the-art experimental and theoretical methods, Spin+X explores new horizons in collective spin effects. Pioneering the concept of Advanced Spin Engineering, Spin+X introduces three novel subfields of spintronics: antiferromagnetic spintronics, orbitronics, and altermagnetism.