I have two young boys, and since they could sit up, they have both loved electrical buttons and switches, especially large arcade style buttons. A couple weeks ago, my youngest snatched one of the prototype arcade buttons off my desk and carried it around with him the whole day pressing it with that soft familiar "click-click". When my oldest was one, he would demand that I hold him so he could flip the light switch in the dining room. He would then jerk his head in a 180 to confirm that the light was now off. Then turn back to the switch, flip it back on, turn his head to confirm the bulbs had turned on again, and repeat, over, and over, and over.
This book is inspired by my sons' curiosity, and a hope that I might be able fuel that curiosity, and keep them entertained without having to suspend them in the air to toggle light switches.