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cloud sand dune nature landscape weather cumulus white sky hill sand desert arid dry barren sparse vegetation plant life growth change time space universe cosmos galaxy star planet moon sun light dark shadow contrast color shape form line texture pattern composition balance harmony unity variety emphasis rhythm movement energy force gravity magnetism electricity heat cold solid liquid gas plasma matter antimatter energy mass spacetime universe cosmos galaxy star planet moon sun light dark shadow contrast color shape form line texture pattern composition balance harmony unity variety emphasis rhythm movement energy force gravity magnetism electricity heat cold solid liquid gas plasma matter antimatter energy mass spacetime