Very nice, and I at first had no idea that this was actually in the form of a Tanka. I like the descriptions you have used as one sees the pendulum as it swings back and forth erasing time with each fluid motion. You had all the syllables correct in each line and thus made the form great and also the way you are able to use such little amount of words and describe and portray what is happening is good as well. As always, I am thoroughly impressed with your poem. Great job and keep writing.

I love the way this flows and the deeper mening reflected with so few words