Thanks to feedback about Suspended I have reposted a revised version. As was pointed out to me (thanks Jessica!) I went overboard with the sentimentality and went one sentence too far (not the first time). Incorporating her suggestions, I think the following version is better in its minimalism.
Two peas in a pod.
The loss of one leaves the other hanging.
Silent but not tranquil.
Motionless but not at rest.