Mature engineering disciplines have handbooks describing adequate solutions to known problems. Bridge designers don't design bridges using the laws of physics, they adapt solutions from the handbook known to work well enough.
Patterns can be the basis for the handbook of software engineering.
They encode adequate solutions to problems known to arise while building systems. A complete pattern language would guide developers to produce workable software solving ordinary problems. PLoP invites you to add your expertise to the growing corpus of patterns. PLoP's focus is improving the expression of patterns. You will have the opportunity to refine and extend your patterns with help from knowledgeable and sympathetic fellow pattern enthusiasts.