Those ones were among the first ones I've made. But then I've made orange flic.kr/p/MauKk9 (I don't always use orange color for my folds, I used it for testing only, but it came out very well). Three of them are hold with rubber bands, to show their minimum collapse state. If you remove the band, you get one that's open. Uncut circles (or polygons) of tant paper, ~15cm in diameter. Final size is ~7-8cm in collapsed state. Opus T-51.