Upside down

The Christmas tree at the corner of Columbia road and 16th street. In the garden of one of the many churches around. It is covered with blue light that change from blue to white progressively: first the top, then a small patch below, then another patch below and so on until the complete tree is lit in a bright white light. Then all the lights turn blue again before the top turns white again.
Something in the pattern does not seem right but I can't put my finger on it until I realize that it is normally arranged the other way: the base of the tree lighting up, then a bit more, then a bit more keeping the top for last until the whole tree is lit. It should not matter but somehow it does. An upside-down display of lights.