This is the old version of the Chinese suanpan with 5 plus 2. The abacus has been used since ancient times. Rosewood abacus or suanpan with 13 rods, two heaven beads and five earth beads upcycled into a table lamp, 16 inches high. Fun and engaging, interactive table lamp that can also be used as a calculating tool. This table lamp provides light and can be used as a calculation tool by sliding the counters along the rods. In addition to the basic functions of addition, subtraction, multiplication, and division, the abacus can calculate square and cubic roots. Each bead in the upper deck has a value of 5; each bead in the lower deck has a value of 1. Beads are considered counted when moved towards the Beam, the piece that separates the two decks. Dimensions:16 inches high x 7 inches wide x 5 inches deep (at bottom)