One of the most valuable things you can do with early prototypes is have prospective users try them, to see whether they're understandable and meet users' needs

One of the most valuable things you can do with early prototypes is have prospective users try them, to see whether they're understandable and meet users' needs. When a prototype looks unfinished, users understand that it can be changed, and you can collaborate with them and explore ideas for making the prototype better.