Wendy and I are in Turkey for two weeks (our second visit). Those readers familiar with the Ball of Whacks know my fondness for geometrical art. Turkey, with its strong Islamic tradition, provides its visitors with many opportunities to take delight in patterns.
Below is part of a panel made from mother of pearl inlay at Topkapi Palace (Istanbul). Note the interplay of octagons and pentagons. Exquisite!
Shown below is part of a wood screen at the Rustempasa mosque (Istanbul). This one has an interplay of hexagons and quadralaterals.