Sand table
A sand table, or sandboard, uses constrained sand for writing, modelling, or educational purposes. The original version of a sand table may be the abax used by early Greek students.
A sand table, or sandboard, uses constrained sand for writing, modelling, or educational purposes. The original version of a sand table may be the abax used by early Greek students.
A sand table, or sandboard, uses constrained sand for writing, modelling, or educational purposes. The original version of a sand table may be the abax used by early Greek students.
Source: Wikipedia "Sand table" · CC BY-SA 4.0
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