In Isaiah 19:16-25, we have a future scenario for Egypt. The 19th verse refers to an ‘altar’ and also a ‘pillar’. What could these be in reference to?

There are some relatively new (in the last 25 years say) theories as to what Is 19:19 and 20, in whatever Bible translation one cares to look at, is referring to when talking about ‘altar’ and ‘pillar’, which one will not find being refere…