Starting a new idea

While I was walking around downtown Seattle at the first Thursday night for artwalk, something popped up in my mind and got stuck there throughout the night, which is something to do with unnatural shapes like rectangles and polygons or circles and ovals, which never exist in natural world I've been painting.
At this moment it's still a vague idea and not sure what to do with it. But I put grids on this painting after finishing more-detailed-than-usual drawing. Then started blocking dark part, carefully not to erase the grid lines. These lines would help me placing shapes at proper positions too, I hope. Will need to wait more what I want to do with them.