security note
If you have reached this site through an instagram link called davidmuellerarts or any blogs with similar names, please ignore, report, block and delete that instagram or blog link. I do not use instagram or blogs now for a long time. I have one old valid account. any new followers, contacts in past couple of years is NOT ME!
I can be directly reached via the contacts page on this site.  any contact on instagram or blog is fraud. someone is trying to scam people in my name. thank you!