The Enterprise-D approaches the sphere. The huge size of this construction is
emphasised by the fact that the ship is still many millions of kilometres away in this image.
At closer range, all appearence of a spherical structure dissapears,
and the Dyson sphere becomes an apparently flat wall.
This entrance port has an entrance area some seventy times greater than
the space doors of Starbase 74, the largest accessway in the Federation.
The interior surface of the sphere was apparently
designed to be class M across most of its area.
The Enterprise-D escapes through the access doors.
There are many hundreds of such ports on the sphere.