Sounds like a neat challenge. Picture a lattice of low‑profile racks, each slide powered by a tiny gear train that pulls a book along a track once the RFID tag pulses. The system would use a swarm of micro‑servos that adjust the rails in real time, so the books rearrange themselves like a living spine. We could program a priority matrix so the most requested titles pop up first, but every movement still feels mechanical, not robotic. I’ll start sketching the gear ratios and a prototype for the sensor array. You bring the book data, I’ll bring the precision.