void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
⠀⠀⠀ float aspect_ratio = iResolution .y / iResolution .x;
⠀⠀⠀ vec2 uv = fragCoord .xy / iResolution .x;
⠀⠀⠀    uv -= vec2( 0.5, 0.5 * aspect_ratio );
⠀⠀⠀ float rot = radians( -30.0 - iTime );
⠀⠀⠀ mat2 rotation_matrix = mat2( cos( rot ), -sin( rot ), sin( rot ), cos( rot ));
⠀⠀⠀    uv = rotation_matrix * uv;

⠀⠀⠀ vec2 scaled_uv = 20.0 * uv;
⠀⠀⠀ vec2 tile = fract( scaled_uv );
⠀⠀⠀ float tile_dist = min( min( tile.x, 1.0 - tile.x ), min( tile.y, 1.0 - tile.y ));
⠀⠀⠀ float square_dist = length( floor( scaled_uv ));

⠀⠀⠀ float edge = sin( iTime - square_dist * 20.0 );
⠀⠀⠀    edge = mod( edge * edge, edge / edge );

⠀⠀⠀ float value = mix( tile_dist, 1.0 - tile_dist, step( 1.0, edge ));
⠀⠀⠀    edge = pow( abs( 1.0 - edge ), 2.2 ) * 0.5;

⠀⠀⠀   value = smoothstep( edge - 0.05, edge, 0.95 * value );

⠀⠀⠀   value += square_dist * 0.1;
⠀⠀⠀   value *= 0.8 - 0.2;
⠀⠀⠀ fragColor = vec4( pow( value, 2.0 ), pow( value, 1.5 ), pow( value, 1.2 ), 1.0 );
}

⠀⠀⠀⠀⠀⠀⠀⠀⢀⡴⠶⠤⣤⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⠶⠲⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⢸⡇⠀⠀⢠⠉⠑⢦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣰⠞⠁⡀⠀⢹⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⢸⡇⠀⠀⠀⢣⠀⠀⠙⢢⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠞⠁⠀⢠⡁⠀⠘⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠈⣧⢀⡀⠀⠸⠀⠀⠀⢀⠏⣳⠴⣶⠶⠞⠛⠉⠉⠉⠓⠛⠒⠢⢄⡈⢏⠢⡀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡄⡀⠉⠑⠒⢒⡶⠚⢀⠵⠊⠀⠀⠀⠀⣀⡴⠦⠄⠀⠀⠀⠀⠀⠙⠢⡘⣆⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⢀⡼⠳⡀⠀⣠⡔⠁⠀⡔⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠣⡱⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⡟⡼⣲⠿⣾⡅⢸⢀⠜⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣆⠀⠀⠀⠱⡙⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⢸⠇⡗⢲⣴⣟⣻⠃⠎⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⡦⡀⠀⢱⠘⣷⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⢸⠀⠉⡼⠁⠣⡀⡜⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⣧⡈⠢⡀⠣⠸⡆⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⣾⠀⠐⢣⠀⠀⡝⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⢠⠃⠀⠀⠀⠀⠀⢸⢡⠀⢃⠀⡇⣿⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⣿⠀⢸⠘⡠⠊⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠃⠀⠀⡾⠀⠀⠀⠀⠀⠀⡎⠀⢣⠀⢇⡁⢹⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⢀⡏⢠⠔⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡎⠀⠀⣸⠃⠀⢀⠀⠀⠀⢠⠁⠁⠂⢃⢈⠇⢸⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⣸⠇⠈⡗⠒⠒⠒⢺⡇⠀⠀⠀⠀⠀⡇⠀⢠⡞⠀⢀⢜⠇⠀⣠⠃⠀⠀⢀⠎⠀⠀⠀⢠⠋⠀⣼⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⡟⠀⢰⠀⢣⠀⠀⢸⠇⠀⠀⠀⠀⠀⢣⠰⠟⢀⠰⠫⣃⡠⢊⠇⠀⠀⡠⢋⠀⠀⠀⠀⠸⠀⢠⡏⠀⠀⠀⠠⠀⠀⠀⠀
⠀⠀⠀⠀⠀⣸⠇⠀⠸⠀⠀⣧⡀⢀⣾⡀⠀⠀⢧⠀⠸⣀⡭⢥⣒⣒⣦⡄⠇⠤⠔⠊⠀⣴⣒⣒⡢⢤⠃⡠⣾⠁⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢠⠏⠀⠀⡇⠀⠀⡏⠻⣮⠈⢇⠀⠀⠈⢷⠄⣹⠉⠁⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⠀⠀⠈⠧⡞⢠⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⣠⠏⠀⠀⠀⡇⠀⢠⠇⠀⠈⠣⣌⣦⠀⠀⠈⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⣧⡞⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⢰⠏⠀⠀⠀⠀⢡⠀⡾⠀⠀⠀⠀⠀⠉⠷⣄⠀⠘⢶⠤⣄⣀⠀⢀⠔⡖⠉⠉⠉⠉⠓⣄⡤⠒⣪⠟⢇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣾⠀⠀⠀⠀⠀⠘⣶⠁⠀⠀⠀⠀⡟⡉⠉⠉⠑⢢⣤⡻⠉⠛⣽⢟⠘⠀⠀⠀⠀⠀⠀⢸⡥⣚⣁⡀⠈⢦⣀⣀⣀⣀⡀⠀⠀⠀⠀
⠀⠀⢹⣷⡀⠀⠀⠀⣄⠸⡄⠀⠀⠀⠀⣷⢃⢸⠉⢿⣿⣈⣙⢢⣴⡗⠊⣉⡷⣄⠀⢒⠴⣊⡉⣭⡏⠁⠐⠒⠂⡤⠤⠤⠤⠭⠭⠁⠀⠀
⠀⠀⠀⠙⢿⣦⢄⠀⠘⣦⠘⣆⠀⠀⠀⢸⣸⡀⡗⣍⣍⢙⣿⣿⡏⢧⣠⣶⡇⠀⠉⠒⠉⠀⣿⣏⡇⠂⠄⠀⠀⠇⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠉⠳⢮⡀⠉⠆⠸⣆⠺⠍⣉⠉⠉⠀⠉⠑⠒⠯⠁⢰⣀⣭⡻⢴⣀⣀⣀⣠⣾⠥⢴⠃⠀⠀⠀⢀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠸⠀⢸⣄⠀⠀⠈⢲⠀⠤⠀⠀⠒⠒⠒⢹⣓⠉⠉⠉⠉⠉⠉⠛⠍⣑⠂⠄⡀⠀⠘⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⣠⣤⡤⠔⠃⠀⢠⠀⣸⠛⠵⣦⢄⠈⠆⠀⠀⠀⠀⠀⠀⢧⠈⠢⢀⠀⠀⠀⣀⡀⠀⠀⠉⠐⠀⠇⠂⠰⣶⣰⣀⡀⠀⠀⠀⠀
⠀⠀⠀⠀⠘⠦⣄⣀⣀⣤⠯⠜⠁⢷⠠⣄⣑⣛⠖⠶⠶⠒⠂⠉⠉⠁⠀⠀⠀⠉⠉⠒⠒⠒⠒⠂⠉⠉⠉⠉⠉⣀⣀⣀⢀⣀⠀⠀⠀