New challenge no. 17: graphite, garden, 10 minutes.
In this case, I take the word 'unintentional' and bring that to my subject - what I can see of the garden outside the window: weeds in the cracks between the wet paving slabs. Never part of the plan.
Obviously the slabs are intentionally square, but the spaces between them are unintentionally irregular. And that's where the dandelion seeds get caught.
After the rain, there's weeding to be done - and I haven't got round to it yet. Just gazed at it dyspeptically through the window.
So I drew it instead. 6B.