Help please. I am teaching coloured light to low ability yr 8. I have done the 3 OHPs with the filters on and they have seen the mixing. I used to have saved a website that animated putting different coloured objects in different coloured light but the site seems to have been taken down. It also had some good stuff on sound and waves. Does anyone have any recomendations? I have been googlng but nothing suitable has popped up.