add adding-machine addition appearance bulky buttons calculate calculating calculations calculators clear Clearance computers computing digits handle heavy input large limitations limited machine numbers numerals office office-equipment output predating press pressing problem-solving problems slow subtract subtraction technology advice answer business challenge challenging choice choose concept control cross decision decisions difficult difficulty direction expertise illustration key leadership manage management negative negativity no opportunity organisation organization pencil positive positivity problem Question questionnaire result right solution solve solving teamwork tick tick-box trouble troubleshoot troubleshooting uncertain uncertainty wrong yes abstract aged art backdrop background color creation design dez pain dirty game graphic grunge grungy jigsaw modern old paper pattern piece playing puzzle render retro stain stained style swirl team texture toy trendy vactor vintage wallpaper worn xymonau blue colourful floral hobby mess mystery pieces pink purple scrapbooking task vector white work Asia bottles civilisation contamination damage danger death decay Dirt disaster disposal dump ecological ecology ecosystem Eichhornia environment environmental fish garbage hyacinth invasive nature patterns of decay plastic poison pollute polluted pollution poor recycle river rubbish scrap sewage toxic trash unhygienic urban urban decay warning waste water affliction aggro black and white bother businessman care concern desire disquiet distress disturbance doubt dreams exasperation fear hang-up headache idea irritation male meditation misgiving musing obsession pain pain in the neck people perceiving perplexed pet peeve provocation rationalization rationalizing realizing reasoning reflection regard rumination scrutiny seeing speculation study suit teasing theorization thinking thought thought bubble tie understanding uneasiness worker worries worry confused confusion questions finance finances money