This day commemorates photographs and the camera. A camera is an irreplaceable tool used to record and replicate memories, events, and people/places. Before the invention of the camera, the only resource to document a vision was a painting.
Cameras have come along way, and as this happens to be take a photo with your phone, you can actual take a photo of your DSLR camera. If you don't want to take a photo of your camera, take a photo of inspiration that you use to keep you going.