upper half of the stairs lower half of the stairs

Staircase

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You are looking at the staircase. That is me in a towel, coming up the stairs. You can ascend or descend.

Notice the bundle of cables hanging under the banister. There is phone lines, television coax, radio coax, half a dozen colourful UTP cables and even 10base2 coax. That is some serious connectivity for a staircase.