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For CSS Grid expertise:
Rachel Andrew: https://gridbyexample.com/
Jen Simmons: http://labs.jensimmons.com/
<div id="holder">
  <div id="left">
    <div id="grid">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t1.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t2.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t3.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t4.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t5.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t6.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t7.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t8.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t9.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t10.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t11.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t12.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t13.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t14.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t15.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t16.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t17.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t18.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t19.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t20.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t21.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t22.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t23.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t24.jpg">
      <img src="https://www.andybarefoot.com/codepen/images/trump/t25.jpg">
    <p id="toggle">Toggle Grid Lines</p>
  <div id="text">
    <p>I once had a book full of amazing Macromedia Flash experiments, one of which was an image of the Mona Lisa that would morph as you moved the mouse over it.</p>
    <p>And as @LawrieCape kindly reminded me in the comments, it was by Yugo Nakamura in "New Masters of Flash".</p>
    <p>Anyway, this is my version of that experiment using CSS Grid to morph the image.</p>

              body {
  color: #FFFCF2;
  background-color: #ff6600;
  font-family: Helvetica, Arial, Sans-Serif;
  text-align: center;
h1 {
  margin-top: 2vh;
  font-size: 1.8em;
p {
  margin-top: 2vh;
  font-size: 1.2em;
  text-decoration: underline;

#holder {
  display: grid;
  grid-template-columns: 90vh 1fr;
  margin: 3vh 5vh 0 5vh;
  grid-gap: 2vh;

#grid {
  display: grid;
  width: 90vh;
  height: 90vh;
  grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
  grid-template-rows:  1fr 1fr 1fr 1fr 1fr;
  grid-gap: 0;

img {
  width: 100%;
  height: 100%;
#left {
  width: 90vh;
#text {
  text-align: left;
  padding-bottom: 20px;
@media  (orientation:portrait) {
  #holder {
    grid-template-columns: 1fr;
  #grid {
    width: 90vw;
    height: 90vw;
  #left {
    width: 90vw;
              var lines = false;
$("#grid").mousemove(function( event ) {
  var leftPer = (event.clientX - $("#grid").offset().left)/$("#grid").width();
  var topPer = (event.clientY - $("#grid").offset().top)/$("#grid").height();
  colStr = "";
  rowStr = "";
    nearX = 1 - (Math.abs(leftPer - (0.1+0.2*i)));
    colStr += " " +  (1 + Math.pow(nearX*5,2))  + "fr";
    nearY = 1 - (Math.abs(topPer - (0.1+0.2*j)));
    rowStr += " " + (1 + Math.pow(nearY*5,2)) + "fr";
  $("#grid").css('grid-template-rows', rowStr);
  $("#grid").css('grid-template-columns', colStr);
$("#grid").mouseout(function() {
  $("#grid").css('grid-template-rows', "1fr 1fr 1fr 1fr 1fr");
  $("#grid").css('grid-template-columns', "1fr 1fr 1fr 1fr 1fr");
$("#toggle" ).click(function() {
    $("#grid").css('grid-gap', "0");
    $("#grid").css('grid-gap', "1px");
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