Most Traditional Quilt Blocks are comprised of: Square, Rectangle,
Half Square Triangle, Quarter Square Triangle and Square on Point Patches.
To read a block first identify each individual Patch Type within the block. Then simply estimate what portion of the block each individual patch spans (1/2, 1/3, 1/4 etc).
The Diagram below shows
each patch type and the portion of the block each patch spans.
Once you are able to read a block you will be able to create the block
without a pattern. You also will be able to create or design your own block.