Recently, we featured Constantinos Economides' Rocking Platforms and shortly afterward, we found his "Rock with Your Child Stool" which is a lovely, more sophisticated version of the platforms.
According to Economides, "Sharing time with your children is always important within a family. This stool provides this intimacy with our children, by allowing both parent and child to use it. The base of this stool is extended to enable a child's stool to be attached to it. As the child grows up, the two stools can separate allowing an individual usage, but still it can be attached back together if parent and child want to rock together."
While definitely unconventional and perhaps a bit esoteric, the Rock with Your Child Stool is undoubtedly a piece with heirloom potential.