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“My dream for all pieces, not just ‘Density’ pieces, but for everything I commission,” she added, “is that it can potentially work with me and a Bluetooth speaker on a granny cart in the subway.”

The humble granny cart, though not hands-free, remains largely undisrupted.

On a downtown 3 train in Midtown Manhattan at 9 a.m., a man lay across four seats with a granny cart by his side, his legs resting across the knees of a woman in a black parka whose body was draped over his.

On Saturday — the first in nearly two years that my neighborhood tamale vendor didn’t walk down my street with a granny cart, calling us out from our homes — I transferred money to Alfonso Martinez via Venmo, and he delivered me a brown paper bag full of tamales by car.

She often sells out within just a couple of hours, smiling and apologizing to disappointed latecomers as she pushes her granny cart out of the narrow passageway.