That's because I haven't planted more than four tomatoes before but there are 20 this year.
The black and blue structure (or is that stricture) is on one side of the path and the red on the other. The black is a ball of stretchy plant tie I had left from when I was quite happy to buy things.
However the red tie is actually made from an old wind-cheater of mine. I cut off the band at the bottom then made one continual spiral cut up to the arm holes. The 'twine' is about 2 cm/1 in wide and it made a long length which I was able to roll into a ball bigger than my fist.
It is quite taut and springs back when pulled. You can see from the picture below that it is a 3 dimensional sculpture. The tomatoes will grow up through it. It supports but does not cut the vines.
Really it is quite a lazy method. Imagine me wandering my vegetable realm in the mornings, maybe with a cup of tea, telling the tomatoes they are doing a great job and training them by poking bits of them here and there. I won't have to run off and get something to tie them up with, find the scissors or worry about extra stakes etc.
Now that, apart from eating their fruit, is my version of bliss!