abstract bubbles

So, this is a bit of an emergency blip - been cooking and just about to go to badminton (went well last week, thanks)...

We have a wine bottle of oil by the side of the cooker for general day to day use, and we keep it topped up from a vat of oil that we keep in the pantry. I had to refill it this evening, and there were nice bubbles in the bottle, especially with the light shining through the green glass.