Conway’s law states that:

[O]rganizations which design systems (in the broad sense used here) are constrained to produce designs which are copies of the communication structures of these organizations.

I propose a new law, in accordance with Garrity’s Law of Eponymous Laws:

Garrity’s Law of Spreadsheets:

We are bound to create spreadsheets that reflect the structure of our own brain.

The only way to truly grok a spreadsheet is to make your own.

See Garrity’s Law of Eponymous Laws