Riis wrote, "you can feel your way, if you cannot see it." what experience was riis describing?

The experience that riis described with that sentence is: Walking up the stairs
Riis wanted to wrote the perspective of people who live in the slum during the period of major urbanization, when 4-5 families shared one appartement building in  order to save their living cost in New York City

It is state and federali really hope this