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Reference.org
Rhombille tiling
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the rhombille tiling, also known as tumbling blocks, reversible cubes, or the dice lattice, is a <a href="/facts/Tessellation/7BWDywXC">tessellation</a> of identical 60° <a href="/facts/Rhombus/T4pU50GF">rhombi</a> on the <a href="/facts/Euclidean_plane/tAUtRFcn">Euclidean plane</a>. Each rhombus has two 60° and two 120° <a href="/facts/Angle/gFUTEQYq">angles</a>; rhombi with this shape are sometimes also called <a href="/facts/Polyiamond/sATfqa4Y">diamonds</a>. Sets of three rhombi meet at their 120° angles, and sets of six rhombi meet at their 60° angles. </p>