0033 The second primer covers sensible and social construction.

This primer is a little loopy, because, when sensible construction fails, social construction begins and when social construction ends, sensible construction begins once again.

0034 I proceed by way of example.

Today, in 2022 AD, all books on human evolution weave the fossil record into a seamless garment, starting around two million years ago and ending with paleolithic hunter-gathers.

A sequence of figures depict the actuality₂ of descent with modification₃.

0035 Descent with modification_3a is situated by evolutionary science_3b.

Here is a picture of a sensible construction.

0036 Clearly, a situation-level nested form emerges from (and situates) a content-level nested form.

Sensible construction is composed of content and situation levels, in a two-level relational structure.