Locking is too hard for programmers to get right over and over again, so the language runtime should do that part.

Drawn from what Rich Hickey said

What this subject means

design How things should be made and judged: what makes a design good, who should do the designing, and what an interface is for.

Mental modelPositioning

What Rich Hickey actually said

Do you hold this korrent?Do you also believe this?

Shared subject first, then similar wording. They may agree or disagree.