"material"=>"steel","artist_name"=>"Harm de Grijs","artwork_type"=>"sculpture"
"artist_name"=>"Cornelia Bruinewoud","artwork_type"=>"sculpture","material"=>"aluminium","start_date"=>"2012"
"material"=>"steel","start_date"=>"1989","artist_name"=>"Bas van Leeuwen","artwork_type"=>"sculpture"