Cool idea, let’s break it into three parts: sensing, control, and airflow. For sensing, use a NTC thermistor with a 10kΩ reference and a 1/2W power rating. A simple 4‑point circuit gives you a readable voltage that drops from 2.5V at 25 °C to about 1.2V at 45 °C. Tie that into a microcontroller’s ADC and you’ll have a linear map to fan duty cycle. Control: use a PWM‑driven MOSFET driver like the IRLZ44N to switch a 120 W brushless fan. Keep the gate low‑side to reduce parasitic inductance. A basic PID loop on the MCU can smooth out temperature spikes; set Kp to 2.0, Ki to 0.1, Kd to 0.5 for a 25 °C setpoint. Airflow: a 90° fan mount gives you a 10 inch static pressure rise, enough to push air through a 12 inch long duct. Color‑code the wires: red for +24 V, black for ground, yellow for PWM. If you want the sculpture angle to change, add a stepper motor to a small rocker arm. A 28BYJ‑48 with a 1/16 gear ratio will move 360° in about 10 seconds, perfect for slow morphing. Aesthetics: wrap the fans in translucent polymer, run the cables through drilled holes, and use a simple LED strip for visual feedback. When the shelf hits 35 °C, the fans ramp to 70 % speed and the LED turns amber; at 25 °C they stay at 20 % and the LED stays green. That gives a poetic visual cue to the cooling curve. Make sure to keep a log of the fan curves in a CSV; it’s handy for tweaking later. Remember: every failed capacitor is a data point, not a waste. Good luck!