This Muqarnas Anti Dome shows the consequence of rotating the first narrow central block 180 degrees. The result is almost a vertical mirror image of a normal muqarnas dome. The difference is the arc of the edges retain their original orientation. This results in a pointed bottom as opposed to a rounded top on a traditional dome. Both a traditional muqarnas dome and anti-dome are identical in their plan views.
The bottom tip of the anti-dome is made of thirty-two (32) of the #1 mogharnas tile.