SinDots 260 byte

//SinDots 260 byte
//Fastled 16x16 rgb matrix demo
//Yaroslaw Turbin, 27.01.2021
//https://vk.com/ldirko
//https://www.reddit.com/user/ldirko/

//for one tweet codegolf competition
//https://www.reddit.com/r/FastLED/comments/jyly1e/challenge_fastled_sketch_that_fits_entirely_in_a/
//https://twitter.com/skullctf/status/1329474477185445890

//look how it look in online emulator:
//https://wokwi.com/arduino/projects/288857088376963592

#include <FastLED.h>
CRGB d[256];byte i,t,u;void setup(){LEDS.addLeds<WS2812,3,GRB>(d,256);}void loop(){t=millis()/15;u=t*2;for(i=13;i--;)d[XY(sin8(t+i*20)>>4,sin8(u+i*20)>>4)].setHue(i*19);blur2d(d,16,16,32);LEDS.show();}int XY(byte x,byte y){return(y*16+x);}