Blooming Tea Set

I bought a tea set flowering and fetch water temperature, he said the tea ball in it and it does bloom, but it floats just beginning and I do not understand why he does not go background on youtube they always go to the bottom

as long as the water added to a pot reheated, it does not matter where the "flower" land. steep for 3-10 minutes and enjoy.

The cut should be glass.
Must be a clear glass without handles.

Must be a pretty big step too thin.