Patent ID: 8647127

Claim:
A demonstration aid system comprising: a. a first fillable demonstration aid; b. a second fillable demonstration aid; c. wherein each said first and said second demonstration aid comprises an upright structure having a bottom surface; front, rear and two side surfaces; and an upper open end; wherein each said upright structure encloses a volume; d. wherein each said upright structure further comprises an extended portion protruding upwardly from each of said front, rear and two side surfaces, thereby forming four extended portions, at least two of said extended portions biased outwardly away from a vertical axis of said upright structure to form a collection hopper into which a material can be deposited; and e. wherein each said upright structure further comprises a removable drawer disposed partially within and near said bottom surface of each said upright structure, said removable drawer including a front surface that remains flush with said front surface of said upright structure when said removable drawer is fully inserted into said upright structure; wherein said front surface of said removable drawer includes a detail that can be gripped to enable said removable drawer to be slidable into and out of said upright structure; and f. further comprising a vertical partition disposed within said upright structure of said first fillable demonstration aid, said vertical partition extending between a lower portion of said collection hopper and a plane that lies immediately above and parallel to an open uppermost portion of said removable drawer of said first fillable demonstration aid; wherein the position of said vertical partition within said upright structure of said first fillable demonstration aid defines two compartments, said compartments defining equal volumes.