Actually, mason147, if you really look into it, it's not as complex as it seems. To close, it needs to have S-24 which is basically a derivation from an original rhombicosidodecahedron. It's a little less, but it'll still work the same. It needs to have well-compacted air-tight joints to be able to fold into its original closed shape and keep all air-vacuuming jots out. The space in it is so small because any bigger and the joints would break open in every unstable point imaginable. There's a lot more to it, but I'll stop here bc the message is getting really long. Thx for listening.