Purist

A LEGO purist is an AFOL who will only use pure or stock LEGO elements. This typically means they will not use building bricks from companies other than The LEGO Company and may choose to avoid customised parts or custom elements. A person may choose to be a purist for a variety of reasons such as a desire to limit the available piece selection as a design challenge or out of a strong brand loyalty for LEGO bricks.

Standards of purity

Not all purists use the same standards of purity. Some areas of difference or variation include the following ideas or activities that purists of various degrees tend to stay away from: (Note that some of these items include the counterarguments used to show why they are “not all that unpure”, which of course not all accept. Some purity arguments are regarded asrunning jokes by many AFOLs.)

Purity tests

There is a LEGO Purity Test floating around on the internet. One version of it can be found here.

Lore

Some arguments about purity and modding, and the justifications for or against have worked their way into fannish lore and even take on the status of running jokes.