Since this critique, we ended up purchasing an Adafruit Dotstar LED strip (rather than individual LEDs). This wasn't just less costly, but also would be more efficient and the LEDs are in a protected strip, rather than having to be individually sewn inside of the pillow. Missing from this list are the two Anker portable chargers that we are using as battery packs for the sensor and lamp's Arduinos respectively.
As far as a our logic goes, we ditched the expression-making feature of the lamp and instead used color and brightness to indicate an approaching object's proximity to the sensor.
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