programming Christian Cohnen 1997, implemented as java applet.

The demo  shows a simple tunnel effect with colors.

canvas { image-rendering: optimizeSpeed; image-rendering: -moz-crisp-edges; image-rendering: -webkit-optimize-contrast; image-rendering: optimize-contrast; -ms-interpolation-mode: nearest-neighbor; width:512; height:512; background-color: black; } http://javascript/colortunnel.min.js (calculated 256*256, display size 512x512 pixels)

Java Applet snippet to include the effect as applet

<applet archive="/pixelfx/ColorTunnel/ColorTunnel.jar" 
code="ColorTunnel.class" width="400" height="400"> 
</applet>