Tropical Twist

Math-----------my nemesis.  While assembling my Tropical Twist I decided it was a row short. I counted, recounted, still could not figure out where I went wrong. I had as many pieces as in the directions........... how could I be short? After adding another row of blocks,  I realized, I wasn't a row short, now I had an extra row. The Tropical Twist turned out very nice. 

Here's the center with the correct number of rows. :-)))) The purples worked well with the blues and greens.