What is with this? Is it a sensory thing?

I have a dcg who has to put her feet on everything. The wall, furniture, toys, other people. She is pretty loose on physical boundaries anyway, but her feet are everywhere all the time. And this is a center so her shoes are always on = gross.

She's not the first kid I've seen do this, and it's not a huge deal, but I just wonder where the urge to put your feet on things comes from.

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