Here are a couple of still shots showing the depth of the footings for the rental cabins that are going up. The first picture below was taken before the actual footing was poured...in other words, the man shown is standing in the bottom of the hole into which the concrete footing will go.
This photo was taken after the footing was poured and cured. It shows the skeleton of the column-to-come, the reinforcement portion of a concrete 'column.' The bottom of the rebar skeleton is set into the now-cured footing, and will provide the reinforcement for the concrete that will be poured around it. A wooden form will be temporarily installed around the rebar and concrete will be poured into the form. The resultant concrete post will be just one of the columns that will help support the building.