I recently joined a Facebook documentary group and right before I joined they had a challenge to capture scenes in the evening, after the sun set, at a higher ISO. For non-photographers, taking photos at a higher "film speed" (ISO comes from the day when photographers used film) can create a lot of grain, dots and pixels in an image, so it is often avoided, unless a photographer really needs to set their camera at a high ISO to get the scene before them.
Since I live in a dark house and in the north of the United States, low light situations and the use of high ISO is often required. It’s something I once lamented, having to push my camera to get a photograph I wanted after dark in my dark home. More and more I now embrace the light and dark and the grain but most of all the creative challenge of finding the right light and the right position to get the shot despite the less than ideal lighting.
I didn't get a chance to submit a photo to the album the other photographers had submitted to in the group, but I tried the challenge myself one night based on their inspiration.
My daughter was bouncing on the bed with her brother, procrastinating bed time, and I decided capturing the moment was more important that whatever grain resulted in the final image. After all, the image and memory was ultimately for me, not for a project that required a clear, non-grainy photograph. In the end I'm glad I grabbed the photograph because it was a memory that will mean something to me, even if it doesn't mean anything for anyone else.