Your search for "optcial" revealed the following:

Drunkard's Path Template Set 8.5" — $52

Optical Quilt Pattern - Printed — $18

Optical Quilt Pattern - PDF — $18

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$10

Optical PDF Pattern and Template Set — $88

Drunkard's Path Template Set 4.25" — $28

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$10

Optical Pattern and Template Set — $88