It looks like he&#x27;s drawing on top of the spreadsheet, rather than using the cells.<p>I&#x27;ve experimented with using a combination of conditional formatting and &quot;creative&quot; formula writing to produce algorithmically generated patterns&#x2F;designs with some success...<p>Basically set cell height and width to 1 and you have a pixel grid. Use formulas to drive values which drives conditional formatting.