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Luke from St Patrick's School responded to this problem. This is how he described the film:

It uses rotating, sliding and shifting (we can call this "translating") . Along with that the triangles are changing from iscoseles to equilateral to scalene and of course right angled!

Luke watched the first 34 seconds and said:

It only uses equilateral and scalene triangles!

Describing the next part, up to a minute, Luke wrote:

The triangle(s) are rotating continuously.

Thank you, Luke. I wonder whether anyone can add any more detail to Luke's comments?