Some people have tried to hide a very small or not at all obvious circle somewhere but I tried to put as many circles in this one as I could. There are circles of sweet wrappers under strips of organza, machine stitched down with more circles and circular scribbles.
This one has circles printed over it using things like a cork, an empty party popper, thread reel, pencil end, card tube. The concentric circles are done using a drawing pin stuck upside down with masking tape on the sewing machine. The sandwich is pressed onto the pin and revolves neatly with the stitching. Shift the pin across for the different sizes. A bit cheaper than those gadgets you can buy. I started cutting back layers (there are fabric scraps trapped under rusty calico), but found it really hard to cut away my nice printed circles, so stopped!
This one has transfer painted circles applied with zigzags and swirly background quilting.
This has more choc wrappers flattened and stitched. The main circle has some foiling across it and black net, with patches of purple net under, cover the whole