There are actually two light sources here: first you have the down-facing panel itself, and then you have a ring on top (flush against the ceiling). You can turn each of these on/off individually, but ...

Let’s start with the simple case: performing an action only when the switch goes active. We’ll assume the switch starts in ...

If you’ve been to a wedding or a downtown coffee shop in the last 10 years, you’ve probably seen those little lightboxes that are so popular these days. They consist of letters placed ...