An ecosystem is different from a portfolio. A portfolio is a collection. An ecosystem is a network where each part strengthens the others.
When my web design studio brings in a client, that client often becomes a custom apparel client too. When the AI lab develops a workflow, the agency uses it next week. Each venture is a node, and the value comes from the connections.
The discipline is to keep the philosophy consistent across all of them: build with purpose, ship with care, treat people well.
