I have shown the interweaving of the nipping and the collar structures at the heart of the "base", simple "Eskimo" bowline as

**a Carrick mat**, in an effort to offer some quantitative definition of "vast:

Now we can dispense with any vain overreach for some pejorative qualitative definition of "vast" for a quantitative one

In general, in a "Eskimo" Carrick mat the returning eye leg passes through 6 crossing points ( 5 when it crosses the nipping loop s line, plus 1 when it crosses itself ), so it can follow 64 x 2 = 128 different paths within and/or around the nipping loop ( x 2, because it can enter into the nipping loop from the "higher" or the "lower" entry point of the mat ). Then, to form the Janus collar, it turns around the Standing end, following a clock-wise or an anti-clockwise direction, so the number of different paths is duplicated again, and reaches 256. Then, it enters into the nipping loop for the third time, through one of the 4 openings, going from the "front" to the "back" side of the mat or vice versa, so the number is multiplied by 4 x 2 = 8, and reaches 256 x 8 = 2048. Then, it enters into the "Eskimo" collar, through one of the 4 openings, so the number is multiplied by 4, and reaches 8.192 ( that is, not even 10.000 !

.

Of course, many of those knots are not stable, and some of them degenerate into some others, so the total number is not so vast - but still it is not very small. Now, even if the 1 / 8 of them is TIB, we are talking about dozens and dozens of different TIB "Eskimo" Janus eyeknots like the one presented in this thread - an interesting challenge for the brave knot tyer !