wavy, waving lines. zig-zag, criss-cross lines . undulate, billowy effect lines

angle angular apex crease criss crisscross crook cross curve deform deformation density distort distortion edge edgy fluctuate geometric irregular jag jagged jaggy lines oscillate oscillation peak pinnacle pointy ridge scallop serrated sharp spike spikey spiky tense tension tortuous uneven vector vertex vibrate vibration wave waving wavy wiggle zag zig zigzag