The emphasis on abstraction is the basis of designThe emphasis on abstraction is the basis of design
Spiral staircase with patterned railings in gray and black tonesSpiral staircase with patterned railings in gray and black tones
Green lines on the desktop with a black backgroundGreen lines on the desktop with a black background
В математике: всякая непрямая линия. Кривая линия, изображающая рост или падение чего-н. в развитии какого-н. процесса.