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function u(t){

c.width=1920; /* clear the canvas */
  for(i=0;i<9;i++)
  x.fillRect(400+i*100+S(t)*300, 400, 50, 200) /* draw 50x200 rects */

} //122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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Xen

remix of #1945 by jes5199

function u(t){

c.width=900;for(a=-0;a<99;a++)for(b=0;b<54;b++){n=255*S(C(a)*C(b)*t*9);x.fillStyle=R(n,0,-n,.7);x.fillRect(a*9,b*9,Z=C(t)+9,Z)}

Sep 22 2017 9:33 PM UTC

}//127/140

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Xen

remix of #3189 by Xen

function u(t){

t?d=x.getImageData(0,0,Z,Z):Z=c.width=200
for(i=9e4;i--;d.data[i]=(i-3)%4?159:159+d.data[i-(4*frame%Z)]%Z);x.putImageData(d,0,0)

Sep 22 2017 7:56 PM UTC

}//129/140

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Xen: W'T'Fx!

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Xen

remix of #3187 by alien

function u(t){

with(x){c.width|=v=(X,Y,R)=>[20*C(X+t)*R+950,20*S(Y+t)*R+550]
for(i=1900;i--;lineWidth=.1)lineTo(...v(4.12*i,4.12*i,i*S(i/t)/29));stroke()}

Sep 21 2017 10:22 PM UTC

}//140/140

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Xen: Fullscreen>Count to 10>Stare at middle.

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Xen

remix of #3183 by New_Core

function u(t){

for(e=290,d=x.getImageData(a=910+e*S(t*2)*2,b=490+e*C(t*2.5),150,b)
,i=6e4;i--;)d.data[i]=(i-3)%4?1:19+d.data[i]%255;x.putImageData(d,a,b)

Sep 21 2017 9:04 PM UTC

}//139/140

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Xen: the longer it runs, the better :)

iverjo: Clever!

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hscells

remix of #3181 by hscells

function u(t){

v=99
p=v*9
x.globalCompositeOperation="source-out"
x.fillRect(p+C(t)*v,v+S(t)*v,v,v)
x.fillRect(p+C(t)*v,0,v,p)
x.fillRect(0,v+S(t)*v,p*3,v)

Sep 21 2017 6:21 PM UTC

}//145/140

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alien

remix of #3186 by alien

function u(t){

with(x){c.width=500;v=(X,Y,R)=>[20*C(X+t)*R+250,20*S(Y+t)*R+150]
for(i=0;i<200;i++)lineTo(...v((4.112)*i,4.112*i,0.1*i*S(i/290)));stroke()
}

Sep 21 2017 2:46 PM UTC

}//142/140

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Xen: Done you a remix: 3190

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alien

remix of #3185 by alien

function u(t){

with(x){c.width=500;v=(X,Y,R)=>[20*C(X+t)*R+250,20*S(Y+t)*R+150]
for(i=0;i<200;i++)lineTo(...v((4.112)*i,4.112*i,0.5*i*S(t/i)));stroke()
}

Sep 21 2017 2:38 PM UTC

}//140/140

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alien: Let it spiral and hang on it's gonna be a wild trip.

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alien

function u(t){

with(x){c.width=500;v=(X,Y,R)=>[20*C(X+t)*R+250,20*S(Y+t)*R+150]
for(i=0;i<200;i++)lineTo(...v((4.112)*i,4.112*i,8*S(t/i)));stroke()
}

Sep 21 2017 2:32 PM UTC

}//136/140

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alien: We are all surrounded by orbiting spirals of energy.

joeytwiddle: Wow how did you make my whole room spin?

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New_Core

remix of #3182 by New_Core

function u(t){

e=490
d=x.getImageData(a=910+e*S(t),b=e+e*C(t*1.1),99,99)
for(i=4e4;i--;)d.data[i]=9+d.data[i]%255
x.putImageData(d,a,b)

Sep 21 2017 12:25 PM UTC

}//123/140

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New_Core

function u(t){

e=490
d=x.getImageData(a=e+e*S(t),b=e+e*C(t*1.1),99,99)
for(i=1e4;i--;d.data[f+3]=255)d.data[f=i*4]=(d.data[f]+9)%255
x.putImageData(d,a,b)

Sep 21 2017 9:40 AM UTC

}//142/140

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cantelope: very creative.