LLocs per crear calidoscòpis
http://www.caleidoscopios.com/index.html
http://www.myoats.com/create.aspx
http://www.zefrank.com/byokal/kal2.html
http://www.permadi.com/java/spaint/spaint.html
http://www.subblue.com/projects/guilloche
http://www.educacionplastica.net/caleidoscopio.html