If we visualize the world as a sort of undifferentiated gray cloud, then a tubaform is a lens which, when we look through it, causes patterns to emerge. They may or may not of course be accurate, but particularly if the pattern remains over time–over motion–then provisional truth claims can be reasonably reliably made.
Have to run, but thought I might clarify that. I may not have, but it is a small effort in that direction.