Things that have agency, that move, are squishy and hard to pin down.

This is good: it's what allows them to adapt and create.

But it's also bad: there's nothing stable that others can use as a foundation to build coherent things on top of.

Building is about creating non-alive structure as a foundation.

This structure stays put in place, a seed crystal of permanence for living things to anchor (temporarily) on and build something coherent and stable.

Structure and living things are both necessary.

Structure however can box in living things, when it prevents the living thing from spreading out, or growing upward.

This is a box, a cage.

Structure that is a platform or trellis allows living things to grow upwards further than they could without it.

A platform that is elevated to start from, or a trellis: a ladder to grab onto and pull themselves upwards.

Good structure supports; bad structure constrains.

The best structure is a living structure, similar to the vine bridges in India that are woven over generations.