Thanks asweet
I am trying now with lengths and angels,  and it doesn’t work either
I seems to me that LSTM tries to make sense of any number as a function of something, but in this case the sequence of shapes and sizes sequences are arbitrary so there is no function to find
On the other hand, when treating it as categorical the sizes create too much variation for categories.  I think I don’t understand how to use the LSTM for this case where there is mix of categorical-numerical  sequences.
In my case there is no logic on the sequence, but common sequences that need to be memorized and identified once the pattern is forming as one of the ‘known’  sequences