Metronomes started randomly synchronize after a short period of time as they influence each other through the side-to-side motion of their shared base.
Source: UCLA Physics & Astronomy
This morning every planet (and Pluto!) was visible in the sky at once. Here is my composite image of the event. Sizes of each object are to scale, space between them is not. This is a downscaled version of the 130 megapixel original- but should still look great if you load in 4k