Interwoven SB coils
They are put together so that centres of the middle "S" are touching at the 90 degrees angle. It looks like configuration like this creates a growing vortex and may be useful in some applications. I'd like to call it "Polish Coil" to salute my homeland.
Vortex Coil
This design is from a fellow Canadian, Ken Gailey, who theoretically calculated magnetic lines configuration of a black hole some 20 years ago, just recently confirmed by telescope pictures.
The picture is a bit deceiving - the sides are in fact a bit sucked-in. The ratio of 1:5 is the most important and the height should equal the large opening. It looks like half of Don's Big Secret coil.
I made several of them from an insulated household wire (14 gauge) - it takes a bit of work, but well worth it. One day I may even make a jig to make it properly.
Try putting it over one of Ed Vos's tetrahedrons from this site:
http://home.hetnet.nl/mr_3/231/midreth/Pyraeng.htm