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              <!-- 
=========================
Author of incredible owl: 
Ben Kwok
http://www.bioworkz.com/ 
=========================
-->
<svg viewBox = "0 0 900 512">
    
    <filter id="invert">
      <feComponentTransfer>
          <feFuncR type="table" tableValues="1 0"/>
          <feFuncG type="table" tableValues="1 0"/>
          <feFuncB type="table" tableValues="1 0"/>
      </feComponentTransfer>
    </filter>
    
    <mask id="mask">
        <image xlink:href="https://img-fotki.yandex.ru/get/16173/5091629.a4/0_8d5ef_68a0b9a4_orig"
               width="900" height="512"
               class="mask__image"
               filter="url(#invert)"
           ></image>
    </mask>
    
    <linearGradient id="gradient-1" 
                    x1="0" y1="0" 
                    y2="100%" y2="100%">
        <stop offset="30%" stop-color="red" class="stop-1"
              stop-opacity="65%"/>
        <stop offset="50%" stop-color="gold" class="stop-transp" 
              stop-opacity="0"/>
        <stop offset="70%" stop-color="red" class="stop-1"
              stop-opacity="65%"/>
    </linearGradient>
    
    <linearGradient id="gradient-2" 
                    x1="100%" y1="100%" 
                    y2="0" y2="0">
        <stop offset="30%" stop-color="red" class="stop-2"
              stop-opacity="50%"/>
        <stop offset="50%" stop-color="gold" class="stop-transp" 
              stop-opacity="0"/>
        <stop offset="70%" stop-color="red" class="stop-2"
              stop-opacity="50%"/>
    </linearGradient>
    
    <radialGradient id="gradient-3" 
                    r="100%">
        <stop offset="15%" stop-color="black"
              stop-opacity="90%"/>
        <stop offset="50%" stop-color="red" class="stop-3"
              stop-opacity="60%"/>
        <stop offset="100%" stop-color="red" class="stop-transp"
              stop-opacity="0"/>
    </radialGradient>
    
    <radialGradient id="gradient-4" 
                    r="100%">
        <stop offset="15%" stop-color="black"
              stop-opacity="90%"/>
        <stop offset="30%" stop-color="red" class="stop-4"
              stop-opacity="60%"/>
        <stop offset="100%" stop-color="red" class="stop-transp"
              stop-opacity="0">
    </radialGradient>
    
    <g mask="url(#mask)"
       transform="translate(0,-20)">
    
        <rect width="100%" height="100%"
              class="rect--fill"></rect>

        <circle r="70%" cx="50%" cy="50%" fill="url(#gradient-1)"
                class="circle--shade">
        </circle>
        <circle r="70%" cx="50%" cy="50%" fill="url(#gradient-2)"
                class="circle--shade">
        </circle>
        
        <!--Bird's Eyes-->
        <circle r="18" cx="405" cy="135" fill="url(#gradient-3)"
                class="circle--eye">
        </circle>
        <circle r="18" cx="480" cy="135" fill="url(#gradient-3)"
                class="circle--eye">
        </circle>
        
        <!--Skull's Eyes-->
        <circle r="33" cx="406" cy="284" fill="url(#gradient-4)"
                class="circle--eye">
        </circle>
        <circle r="33" cx="484" cy="284" fill="url(#gradient-4)"
                class="circle--eye">
        </circle>
    </g>
    
</svg>

<div class="range-wrapper">
    <input type="range" 
           min="0" max="360" value="180"
           class="range-input" />
</div>

            
          
!
            
              * {
    box-sizing: border-box;
}

$width: 900px;
$height: 512px;

BODY {
    background: #000;
}

svg {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    max-width: $width;
    height: 100%;
    max-height: $height;
    margin: auto;
    // border: 2px solid red;
}

.range-wrapper {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 10vh;
    line-height: 12vh;
    text-align: center;
    background: linear-gradient( to right,
        hsl( 0, 100%,50%),
        hsl( 60, 100%,50%),
        hsl( 90, 100%,50%),
        hsl( 150, 100%,50%),
        hsl( 210, 100%,50%),
        hsl( 270, 100%,50%),
        hsl( 360, 100%,50%)
    );
    }
.range-input {
    width: 98%;
}

.circle--shade {
    transform-origin: $width/2 $height/2;
    animation: rotation 6s linear infinite;
    
    &:nth-child(even) {
        animation-direction: reverse;
        animation-duration: 10s;
        }
    }

@keyframes rotation {
    0% {
        transform: rotate( 0deg );
    }
    50% {
        transform: rotate( 360deg );
    }
}
            
          
!
            
              console.clear();

var doc = document;
var rangeInput = doc.querySelector('.range-input');
var rangeWrapper = doc.querySelector('.range-wrapper');

var rectFill = doc.querySelector('.rect--fill');

var colorizeSet = [
    {
        list: doc.querySelectorAll('.stop-1'),
        colorFunc: increaseHue
    },
    {
        list: doc.querySelectorAll('.stop-2'),
        colorFunc: decreaseHue
    },
    {
        list: doc.querySelectorAll('.stop-3'),
        colorFunc: increaseHueLarge
    },
    {
        list: doc.querySelectorAll('.stop-4'),
        colorFunc: decreaseHueLarge
    },
    {
        list: doc.querySelectorAll('.stop-transp')
    }
];

var colorHue = 180;
var step = 120;
var stepSmall = 30;
var stepLarge = 150;

var direction = 'forward';
var autoScroll = true;
var changeColorFunc = increaseHue;

var myInt;

function setInt () {
    myInt = window.setInterval(changeColor, 30);
}

rangeWrapper.onmouseover = function () {
    autoScroll = false;
    window.clearInterval( myInt );
}

rangeWrapper.onmouseout = function () {
    autoScroll = true;
    setInt();
}

function changeColor () {
    
    if ( autoScroll ) {
        
        if ( colorHue > 355 ) {
            changeColorFunc = decreaseHue;
        }
        else if ( colorHue < 5 ) {
            changeColorFunc = increaseHue;
        }
    } 
    
    colorHue = changeColorFunc(1);
    rangeInput.value = colorHue;
    
    setFill();
    setGradients();
}

rangeInput.oninput = function () {
    colorHue = +this.value;
    setFill();
    setGradients();
};

function setFill() {
    var color = 'hsl(' + colorHue + ', 100%, 50%)';
    rectFill.setAttribute('fill', color);
}

function increaseHue ( newStep ) {
    var colorStep = newStep || step;
    
    /*console.log('colorStep ' + colorStep);
    console.log('newStep ' + newStep);*/
    
    var color = colorHue + colorStep;
    
    if ( color > 360 ) {
        color = color - 360;
    }
    
    return color;
}

function increaseHueSmall () {
    return increaseHue( stepSmall );
}

function increaseHueLarge () {
    return increaseHue( stepLarge );
}

function decreaseHue ( newStep ) {
    var colorStep = newStep || step;
    
    var color = colorHue - colorStep;
    
    if ( color < 0) {
        color = color + 360;
    }
    
    return color;
};

function decreaseHueSmall () {
    return decreaseHue( stepSmall );
}

function decreaseHueLarge () {
    return decreaseHue( stepLarge );
}

function setStops ( list, colorFunc ) {
    var newColorHue = colorFunc ? colorFunc() : colorHue;    
    var color = 'hsl(' + newColorHue + ', 100%, 50%)';
    
    for ( var i = 0; i < list.length; i++) {
        list[ i ].setAttribute('stop-color', color);
    }
}

var setGradients = function () {
    for ( var i = 0; i < colorizeSet.length; i++ ) {
        var item = colorizeSet[i];
        setStops( item.list, item.colorFunc );
    }   
}

setInt ();
setFill ();
setGradients ();

            
          
!
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