Final answer:
WHMIS and HHPS use pictures to ensure universal understanding and overcome language barriers, facilitating quick recognition of hazards, which is a regulatory requirement for safety.
Step-by-step explanation:
WHMIS (Workplace Hazardous Materials Information System) and HHPS (Hazardous Household Product Symbols) utilize pictures instead of words primarily for universal understanding and to overcome language barriers. Pictograms offer an immediate and universally recognizable method of communication about potential hazards. This facilitates quick recognition, which is crucial for safety in environments where hazardous materials are used. While aesthetics might enhance visual communication and pictures could engage learners effectively, these are not the primary reasons for the use of WHMIS and HHPS symbols. The rapid communication of hazards is a regulatory requirement, aiming for the highest level of safety and comprehension across varied linguistic backgrounds.